docs: update conntector and error code page, remove rest connect type

[sheyanjie-qq]

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 @sheyanjie-qq, 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 focuses on a substantial overhaul of the TDengine documentation, specifically targeting the organization and clarity of information regarding database connectors and error codes. By introducing reusable MDX components and centralizing error code references, the changes aim to provide a more consistent, maintainable, and user-friendly documentation experience. The update also refines the guidance on connection methods, promoting WebSocket connections and clarifying the scope of direct REST API interactions.

Highlights

• Documentation Refactoring: The documentation for TDengine connectors and error codes has undergone a significant refactoring. Common introductory text, connection methods, and platform compatibility matrices have been extracted into reusable MDX components (_connector_type.mdx and _platform_supported.mdx) for improved consistency and maintainability across English and Chinese documentation.
• Centralized Error Codes: All detailed error code tables, previously embedded within individual language-specific connector documentation (C++, Java, Node.js, Rust, C#), have been consolidated into a single, comprehensive error-code.md document. This centralizes error information for both TSDB (server/client) and connector-specific errors, making it easier for developers to reference.
• Clarified REST API Usage: The documentation now clearly distinguishes between using language-specific connectors (which can leverage WebSocket or Native connections) and directly interacting with the TDengine REST API. Direct REST API usage is noted to have more limited functionality (primarily SQL execution) compared to connectors, and previous 'REST connection' examples within connectors have been largely removed or de-emphasized in favor of WebSocket connections.
• Java Example Update: A minor update was made to the Java MyBatis-Plus example, adding a new countBySql method to the MetersMapper interface and a corresponding test case to verify its functionality.

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[gemini-code-assist]

Code Review

This pull request significantly improves the documentation by refactoring shared content into reusable components and centralizing the error code information. This enhances maintainability and consistency across the documentation. The changes also seem to de-emphasize REST connections in favor of WebSocket connections, which is a significant strategic update.

My review includes a critical security suggestion for an example file to prevent SQL injection, and a suggestion to improve the clarity and maintainability of the new error code page.

Also, there's a small typo in the pull request title: 'connttector' should be 'connector'.

[zitsen]

LGTM