Tracking issue for bounding `pallet-staking` storage items

related to https://github.com/paritytech/polkadot-sdk/issues/323 and https://github.com/paritytech/substrate/issues/9724

If we simply remove the `pallet::without_storage_info`, we get an error about the following items: 


<details>
<summary>Full Errors</summary>

```
error[E0277]: the trait bound `std::vec::Vec<<T as frame_system::Config>::AccountId>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `std::vec::Vec<<T as frame_system::Config>::AccountId>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageInvulnerables<T>, std::vec::Vec<<T as frame_system::Config>::AccountId>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `StakingLedger<T>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `StakingLedger<T>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStorageLedger<T>, frame_support::Blake2_128Concat, <T as frame_system::Config>::AccountId, StakingLedger<T>>`

error[E0277]: the trait bound `RewardDestination<<T as frame_system::Config>::AccountId>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `RewardDestination<<T as frame_system::Config>::AccountId>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStoragePayee<T>, frame_support::Twox64Concat, <T as frame_system::Config>::AccountId, RewardDestination<<T as frame_system::Config>::AccountId>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `ValidatorPrefs: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `ValidatorPrefs`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::CountedStorageMap<pallet::pallet::_GeneratedPrefixForStorageValidators<T>, frame_support::Twox64Concat, <T as frame_system::Config>::AccountId, ValidatorPrefs, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `Nominations<T>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `Nominations<T>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::CountedStorageMap<_GeneratedPrefixForStorageNominators<T>, frame_support::Twox64Concat, <T as frame_system::Config>::AccountId, Nominations<T>>`

error[E0277]: the trait bound `ActiveEraInfo: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `ActiveEraInfo`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageActiveEra<T>, ActiveEraInfo>`

error[E0277]: the trait bound `Exposure<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `Exposure<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageDoubleMap<_GeneratedPrefixForStorageErasStakers<T>, frame_support::Twox64Concat, u32, frame_support::Twox64Concat, <T as frame_system::Config>::AccountId, Exposure<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `EraRewardPoints<<T as frame_system::Config>::AccountId>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `EraRewardPoints<<T as frame_system::Config>::AccountId>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStorageErasRewardPoints<T>, frame_support::Twox64Concat, u32, EraRewardPoints<<T as frame_system::Config>::AccountId>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `Forcing: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `Forcing`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageForceEra<T>, Forcing, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `std::vec::Vec<UnappliedSlash<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `std::vec::Vec<UnappliedSlash<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStorageUnappliedSlashes<T>, frame_support::Twox64Concat, u32, std::vec::Vec<UnappliedSlash<<T as frame_system::Config>::AccountId, <T as pallet::pallet::Config>::CurrencyBalance>>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `std::vec::Vec<(u32, u32)>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `std::vec::Vec<(u32, u32)>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageBondedEras<T>, std::vec::Vec<(u32, u32)>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `slashing::SlashingSpans: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `slashing::SlashingSpans`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStorageSlashingSpans<T>, frame_support::Twox64Concat, <T as frame_system::Config>::AccountId, slashing::SlashingSpans>`

error[E0277]: the trait bound `SpanRecord<<T as pallet::pallet::Config>::CurrencyBalance>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `SpanRecord<<T as pallet::pallet::Config>::CurrencyBalance>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageMap<_GeneratedPrefixForStorageSpanSlash<T>, frame_support::Twox64Concat, (<T as frame_system::Config>::AccountId, u32), SpanRecord<<T as pallet::pallet::Config>::CurrencyBalance>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `std::vec::Vec<(u32, bool)>: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `std::vec::Vec<(u32, bool)>`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageOffendingValidators<T>, std::vec::Vec<(u32, bool)>, frame_support::pallet_prelude::ValueQuery>`

error[E0277]: the trait bound `Releases: parity_scale_codec::MaxEncodedLen` is not satisfied
  --> frame/staking/src/pallet/mod.rs:59:12
   |
59 |     #[pallet::pallet]
   |               ^^^^^^ the trait `parity_scale_codec::MaxEncodedLen` is not implemented for `Releases`
   |
   = help: the following other types implement trait `parity_scale_codec::MaxEncodedLen`:
             ()
             (TupleElement0, TupleElement1)
             (TupleElement0, TupleElement1, TupleElement2)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6)
             (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5, TupleElement6, TupleElement7)
           and 78 others
   = note: required because of the requirements on the impl of `StorageInfoTrait` for `frame_support::pallet_prelude::StorageValue<_GeneratedPrefixForStorageStorageVersion<T>, Releases, frame_support::pallet_prelude::ValueQuery>`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `pallet-staking` due to 15 previous errors

```  

</details>

- `Invulnerables`
- `StakingLedger`
- `Payee`
- `Validators` / `ValidatorPrefs`
- `Nominators` / `Nominations` 
- `ErasStakers` / `ErasStakersClipped` / `Exposure`
- `ActiveEraInfo`
- `ErasRewardPoints`
- `Forcing`
- `UnappliedSlashes`
- `BondedEras`
- `SlashingSpans`
- `OffendingValidators`
- `Releases`

I categorize these into 4 groups:

1. [[Done](https://github.com/paritytech/substrate/pull/12230)] Trivial ones. These are generally 1 liner changes for the type to `derive(MaxEncodedLen)`. This list includes: 
2. [[Done](https://github.com/paritytech/substrate/pull/12230)] Bounded by `HistoryDepth`. This includes only `StakingLedger`. Also, a number of storage maps and double maps have an invariant that the number of their keys should never exceed `HistoryDepth`. We should detect these, and make sure they are always respected (use `try_state`).
3. [[Done](https://github.com/paritytech/substrate/pull/12436)] Bounding by `MaxActiveValidators`. These are storage item who's bound is missing because we don't enforce a bound on the maximum number of active validators.
  - This will eventually leak into `election-provider-mutli-phase`, and staking would express: type `ElectionProvider<MaxWinners = Self::MaxActiveValidators>`
  - This will eventually help staking pallet bound the number of validators into session as well. In other words
  - @Doordashcon started this with https://github.com/paritytech/substrate/pull/11967 and https://github.com/paritytech/substrate/pull/12125, but I think we should start from scratch based on my draft in https://github.com/paritytech/substrate/tree/kiz-properly-bound-staking-validators. 
4. [[Weakly bounded in this PR](https://github.com/paritytech/substrate/pull/13498)] Bounding by maximum number of active exposed nominators per validator, i.e. `MaxBackersPerWinner`. @ggwpez started doing this in paritytech/substrate#11935, we need someone to finish it.
5. Slashing related storage items. These are the more scary ones, and I am not sure if and how we should bound them. The slashing code needs an overhaul in any case. 

So, these are the bounds we know: 
- `MaxActiveValidators`:
  - `Invulnerables`
  - `ErasRewardPoints`
- `MaxBackersPerWinner`
  - `ErasStakers` / `ErasStakersClipped` / `Exposure`
- `HistoryDepth`
  - `StakingLedger` 
- Trivial
  - `ActiveEraInfo`
  - `Forcing`
  - `Payee`
  - `Validators` / `ValidatorPrefs`
  - `Nominators` / `Nominations` 
  -`Releases`
- Slashing, unknown
  - `UnappliedSlashes`
  - `BondedEras`
  - `SlashingSpans`
  - `OffendingValidators`

> It is hard to predict all of these without actually writing the entire code. I might be wrong in some places. 

- An easy action item, which I am happy to mentor for someone external is to take care of all the trivial ones. 
- I am not sure about `MaxActiveValidators`. I might prefer doing it myself since it is rather important and touches a few pallets. Nonetheless, I am grateful for @Doordashcon's effort here so far and will acknowledge it. 
- `MaxBackersPerWinner` needs completion by me and @ggwpez 
- Slashing is a project of its own. 




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Tracking issue for bounding `pallet-staking` storage items #255

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Tracking issue for bounding pallet-staking storage items #255

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Tracking issue for bounding `pallet-staking` storage items #255