feat: add CSV export of epoch transactions for address

[fedor-ivn]

Closes #11194, closes #11201.

Motivation

The Celo community requested that validators retain the ability to export epoch transaction data when migrating to our instance. This feature is crucial for calculating earnings from participating in validator groups within the Celo protocol.

For context, the legacy Celo explorer provides a similar feature on the validator address page, where users can generate a CSV export for this data.

Changelog

Enhancements

• Introduced a new /api/v1/celo-election-rewards-csv endpoint and the AddressElectionRewardsCsvExporter module.

⚠️ Note: The exported table does not preserve the "LockedGold" and "VotingGold" fields, since this data is not indexed.

Bug fixes

• Pagination of election rewards when the type of reward is delegated_payment

Checklist for your Pull Request (PR)

• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to docs repository.
• If I added/changed/removed ENV var, I submitted a PR to docs repository to update the list of env vars and I updated the version to master in the Version column. If I removed variable, I added it to Deprecated ENV Variables page. After merging docs PR, changes will be reflected in these pages.
• If I added new DB indices, I checked, that they are not redundant, with PGHero or other tools.
• If I added/removed chain type, I modified the Github CI matrix and PR labels accordingly.