Missing API endpoint for rewards attestations

[apentori]

Describe the bug:

Missing API endpoint for rewards per attestations /eth/v1/beacon/rewards/attestations/{epoch}.

I couldn't find the Method in rest_rewards_api.nim

To Reproduce
Steps to reproduce the behavior:

1. Platform details (OS, architecture): Linux x86_64
2. Branch/commit used: unstable
3. Commands being executed:

   curl --show-error --fail-with-body --silent -X POST http://geth-01.ih-eu-mda1.nimbus.mainnet.status.im/eth/v1/beacon/rewards/attestations/395293 \
      -H 'Content_type: application/json' \
      --data '["775694"]'
    curl: (22) The requested URL returned error: 404
   

4. Relevant log lines: .

Additional context

This missing endpoint make it impossible to run https://github.com/kilnfi/eth-validator-watcher using nimbus-eth2,