add megaeth

[PikaZ76]

What changed? Why?

add Megaeth

How did you test the change?

• unit test
• integration test
• functional test
• adhoc test (described below)

[gemini-code-assist]

Summary of Changes

Hello @PikaZ76, 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 integrates the new MegaETH blockchain into the system. It establishes the necessary configuration for MegaETH across various environments, updates the core protobuf definitions to recognize the new blockchain and its mainnet, and incorporates its client and parser logic by efficiently reusing existing Ethereum components due to MegaETH being an EVM chain.

Highlights

• New Blockchain Integration: Added comprehensive support for the MegaETH blockchain, enabling its integration into the system.
• Configuration Files: Introduced new YAML configuration files for MegaETH across base, development, local, and production environments, defining its operational parameters.
• Protobuf Updates: Updated the common protobuf definitions to include new enum values for BLOCKCHAIN_MEGAETH and NETWORK_MEGAETH_MAINNET, ensuring proper identification within the system.
• Client and Parser Reusability: Implemented the MegaETH client, native parser, and validator by efficiently reusing existing Ethereum implementations, leveraging MegaETH's compatibility as an EVM chain.
• Minor Configuration Reordering: A minor reordering of the tx_batch_size parameter occurred in the Bitcoin Cash mainnet base configuration file, which appears to be a formatting adjustment.

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[gemini-code-assist]

Code Review

This pull request adds support for the Megaeth blockchain. The approach of reusing existing Ethereum components for this EVM-compatible chain is sound, and the necessary wiring in the Go code and Protobuf files is done correctly. My main concerns are with the configuration files. It appears that generated files (config/chainstorage/megaeth/mainnet/*.yml) have been checked in, which is generally discouraged. Instead, only the source templates (config_templates/config/chainstorage/megaeth/mainnet/*.template.yml) should be part of the repository. I've also noted that templates for local and production environments are missing, and some generated files are being modified directly. Please see the detailed comments for specific suggestions on how to address these issues.