Add cache for get blocks by number

[peterargue]

This PR adds a simple cache for the response from GetBlockByNumber, which can be heavy when there are a lot of tx in a block

[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 peter/soft-finality-blockbynumber-cache

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[m-Peter]

Given that GetBlockByHash, does pretty much the exact same DB calls, we could possibly improve that one too.

[peterargue]

yea. now that we're not in a rush to get something out, I think we should take a more wholistic approach to caching based on our findings from the load test

[m-Peter]

LGTM!