feat(taos): add connector info for perf_connections

[wangmm0220]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @wangmm0220, 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 enhances the client connection capabilities by adding a new option to set 'connector information'. This allows client applications to provide details about the specific connector being used, which is then recorded and made available through the performance schema. This feature improves diagnostic capabilities and provides better insights into the types of clients connecting to the system.

Highlights

• New Connection Option: Introduced TSDB_OPTION_CONNECTION_CONNECTOR_INFO to allow clients to specify connector-specific information.
• Enhanced Observability: The provided connector information is now stored and exposed via the performance_schema.perf_connections table, alongside native_version.
• Documentation Updates: Updated both English and Chinese documentation for taos_options_connection to reflect the new option and its usage, including the maximum string length of 255 characters.
• Unit and System Tests: Added unit tests to verify the functionality of setting and truncating the connector info, and updated system tests to account for the new columns in performance_schema.

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[gemini-code-assist]

Code Review

This pull request introduces a new connection option, TSDB_OPTION_CONNECTION_CONNECTOR_INFO, to allow clients to set connector information. This information, along with the native client version, is then propagated to the performance_schema.perf_connections table. The changes are well-implemented across documentation, client API, server-side logic, and tests. The code is correct and follows existing patterns. I have one suggestion to improve maintainability by reducing code duplication in one of the modified files.