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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