chore: Implement attestation message handling

[alpe]

🚧 WIP: This breaks IBC transfers test currently: Error: No IBC denom found in balance after transfer!

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[gemini-code-assist]

Summary of Changes

Hello @alpe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the core logic for handling attestation messages within the network module. It significantly refactors the existing Attest message handler to incorporate robust vote signature and block hash verification, leveraging a newly introduced BlockSource interface for historical block data retrieval. The changes also refine the epoch-based attestation tracking and include comprehensive unit tests for the new functionality. This is an early, work-in-progress version laying the groundwork for secure attestation processing.

Highlights

• Attestation Message Refactoring: The Attest message handler has been significantly refactored into smaller, more focused helper functions (validateAttestation, updateAttestationBitmap, updateEpochBitmap, verifyVote) to improve readability and maintainability.
• Vote Signature Verification: The Attest message now includes robust verification of the CometBFT vote signature and block hash against historical block data, ensuring the authenticity and integrity of attestations. This is handled by the new verifyVote function.
• Block Source Integration: A new BlockSource interface has been introduced and integrated into the Keeper to allow fetching historical block data, which is crucial for the vote verification process.
• Epoch-based Attestation Logic: The attestation process now explicitly checks that validators are attesting for the immediately preceding epoch (GetCurrentEpoch() != votedEpoch+1), and the epoch bitmap logic has been refined with a dedicated updateEpochBitmap helper.
• Enhanced Testing: A new comprehensive test suite for the Attest message has been added, including mocking of external dependencies like the StakingKeeper and BlockSource, to ensure the correctness of the new verification logic.

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[gemini-code-assist]

Code Review

The pull request implements attestation message handling, including validation, bitmap updates, and signature verification. It also adds a BlockSource interface for retrieving block data. The code includes new functions for validating attestations, updating bitmaps, and verifying votes. The changes also include adding a block source to the keeper and updating the message server to handle attestation messages.

[alpe]

/gemini help

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The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point in your pull request via creating an issue comment (i.e. comment on the pull request page) using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in issue comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist is currently in preview and may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments to provide feedback.