feat: POST /eligible-deals-batch

[bajtos]

See CheckerNetwork/roadmap#218

Create a new API endpoint allowing trusted clients like deal-observer to add
more deals to the list of deals eligible for retrieval testing.

TODO:

• access-token-based authorization

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Cannot convert undefined to a BigInt getMeridianRoundDetails(index) View Issue

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