Add script + guide to set aggregator address

Description

Adds script and guide to set the aggregator address of the AlignedServiceManager.sol contract

To Test

• Start local anvil node.

make anvil_start_with_block_time
```bash
- Check the current value of `alignedAggregator` within the AlignedServiceManager.sol contract.
```bash
cast call 0x851356ae760d987E095750cCeb3bC6014560891C "alignedAggregator()(address)"

• Set the value of alignedAggregator using the script.

export AGGREGATOR_ADDRESS=0x0000000000000000000000000000000000000001
make set_aggregator_address_devnet

• Verify alignedAggregator has been changed to 0x0000000000000000000000000000000000000001 within the AlignedServiceManager.sol contract.

cast call 0x851356ae760d987E095750cCeb3bC6014560891C "alignedAggregator()(address)"

Type of change

Please delete options that are not relevant.

• New feature

Checklist

• “Hotfix” to testnet, everything else to staging
• Linked to Github Issue
• This change depends on code or research by an external entity
  • Acknowledgements were updated to give credit
• Unit tests added
• This change requires new documentation.
  • Documentation has been added/updated.
• This change is an Optimization
  • Benchmarks added/run
• Has a known issue
  • Link to the open issue addressing it
• If your PR changes the Operator compatibility (Ex: Upgrade prover versions)
  • This PR adds compatibility for operator for both versions and do not change batcher/docs/examples
  • This PR updates batcher and docs/examples to the newer version. This requires the operator are already updated to be compatible