Batch stats endpoint should return an array of summarized batches information

Description

This PR does the following changes:

• Rename the /api/proofs_verified_last_24h to api/verified_batches_summary
• Modifies the endpoint to return an array of batches summarized data
• Add config values to be used in batch gas cost calculation

The summarized data has the following format:

{
  "batches": [
    {
      "date": "2025-01-07",
      "amount_of_proofs": 12,
      "gas_cost": 3249000
    },
    {
      "date": "2025-01-08",
      "amount_of_proofs": 826,
      "gas_cost": 223639500
    }
  ]
}

How to test

1. Start a devnet
2. Send a fixed amount of proofs
3. Visit /api/verified_batches_summary
4. Check that the amount of proofs matches the ones shown in the explorer
5. Check that the gas cost calculation is correct

How to calculate the gas cost

The gas cost for each batch is derived from the following formula:

CONSTANT_GAS_COST = AGGREGATOR_GAS_COST * AGGREGATOR_MULTIPLIER) / PERCENTAGE_DIVIDER + BATCHER_SUBMISSION_GAS_COST

BATCH_GAS_COST = CONSTANT_GAS_COST + amount_of_proofs * ADDITIONAL_SUBMISSION_GAS_COST_PER_PROOF

By using the following values:

config :explorer,
  batcher_submission_gas_cost: 125000,
  aggregator_gas_cost: 330000,
  additional_submission_gas_cost_per_proof: 2000,
  aggregator_fee_percentage_multiplier: 125,
  percentage_divider: 100

The calculation is:

BATCH_GAS_COST = (330000 * 125 / 100 + 125000) + 2000 * amount_of_proofs

Type of change

• New feature
• Bug fix
• Optimization
• Refactor

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