feat(da-indexer): add support for eigenda_v2 blobs retrieval via proxy

[rimrakhimov]

The PR adds a new endpoint which allows to retrieve blobs from eigenda V2 via 3-rd party eigenda-proxy. The service, accepts the eigenda commitments and try to retrieve corresponding blob through the proxy. If successful it stores that blob in the database, so that the next time the same commitment is requested, it can be retrieved from the local database (and, thus, definitely has the corresponding blob available)

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rimrakhimov/da-indexer/support-eigenda-proxy

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