Bugfix handling of fixed hash

[sideninja]

Closes: #509

Description

Fix dropping of RLP encoding unexported field of fixed hash so it persists when decoded from the index.

---

For contributor use:

• [ ] Targeted PR against master branch
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Code follows the standards mentioned here.
• [ ] Updated relevant documentation
• [ ] Re-reviewed Files changed in the Github PR explorer
• [ ] Added appropriate labels

Summary by CodeRabbit

• New Features

  • Introduced a FixedHash field in the Block structure for consistent hash calculations.
  • Added a new function to decode legacy block events, improving compatibility with older data formats.

• Bug Fixes

  • Enhanced hash handling and decoding logic to ensure robustness against changes in block formats.

• Tests

  • Added new test cases to validate the functionality of fixed hash handling and legacy block event decoding, ensuring reliability of updates.

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Commits

Files that changed from the base of the PR and between f5adb56afa9bd5cb18d03dfbb16bb28f2d52e50f and 96d76f7de2cdf6509d2c9d497b3cffa511ea3bbc.

Walkthrough

The changes introduce a new field, FixedHash, to the Block struct in models/block.go, enhancing hash management. The Hash() method is updated to prioritize this fixed hash when available. Additionally, a new function for decoding legacy block events is added. Corresponding tests in models/block_test.go validate these functionalities, ensuring that both hashing and legacy event decoding operate correctly.

Changes

Files	Change Summary
models/block.go	Added FixedHash field to Block, modified Hash() method, introduced decodeLegacyBlockEvent, and added blockEventPayloadV0 type.
models/block_test.go	Added tests for fixed hash functionality and legacy block event decoding, along with a helper function for hash conversion.
tests/web3js/eth_non_interactive_test.js	Updated expected block size in a test case.

Assessment against linked issues

Objective	Addressed	Explanation
Block hash consistency with evm-testnet.flowscan (##509)	✅
Ensure legacy data can be processed correctly (##509)	✅

Poem

In the meadow, I hop and play,
New hashes here to brighten the day!
With fixed values, we leap and bound,
Legacy events, joyfully found.
Oh, what fun in code we weave,
A rabbit's cheer, we all believe! 🐇✨

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