refactor: extract attester command to ev-abci

[julienrbrt]

Closes: #269

This command is really complex and could be a lot simplified. This should definitely still be done.
I've simplified a bunch as suggested here: #230 (comment) but still more is left to be done.

[gemini-code-assist]

Summary of Changes

Hello @julienrbrt, 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 significantly refactors the attester command, transitioning it from an independent executable to an integral part of the ev-abci server. This change streamlines the command's architecture, simplifies its configuration, and enhances its maintainability by consolidating it within the main application's command-line interface. The refactoring also includes a general cleanup of the codebase and the addition of dedicated tests and updated documentation.

Highlights

• Refactor Attester Command: The standalone attester command has been refactored and integrated into the ev-abci server as a cobra.Command, moving its source code from attester/main.go to server/attester_cmd.go.
• Simplified Configuration: Flag parsing and client context creation for the attester command have been simplified by leveraging client.GetClientContextFromCmd, reducing boilerplate and improving consistency with other ev-abci commands.
• Codebase Cleanup: Redundant imports, comments, and helper functions (like createClientContext) have been removed, making the attester logic more concise and easier to maintain.
• Enhanced Documentation and Testing: New unit tests (server/attester_cmd_test.go) have been added for key attester functionalities, and comprehensive documentation (server/docs/attester_cmd.md) is now available for the integrated command.

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[gemini-code-assist]

Code Review

This pull request successfully refactors the standalone attester into a more integrated command within the ev-abci server, which is a great improvement. The code is simplified by leveraging the existing client context. However, I've identified a critical issue where the Bech32 prefix configuration is missing, which will prevent the command from working correctly. The documentation for the new command is also out of sync with the implementation, which could confuse users. Additionally, I've provided several suggestions to enhance maintainability and robustness, such as improving state management, avoiding hardcoded values, and using more idiomatic Go.

[tac0turtle]

utACK