feat(contract): add amount_of_proofs in TaskCreated event

[uri-99]

Add amountOfProofs to TaskCreated evnet in BatcherPaymentService

Description

Important

We should reconsider this feature

Currently, nobody is querying this event, so this change shouldn't break any other component.

This feature may be of help in the future, but at the same time I wouldn't upgrade this contract for only this fix. It may be an acceptable PR if it is redeployed with another BatcherPayments upgrade.

Type of change

Please delete options that are not relevant.

• 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