Feat: better load and fetch compile command

[Guo-Shiyu]

This PR optimizes the way to load and fetch compilation commands from CDB, and typo fix.

1. During server initialization, if no valid CDB was found in given directories, try to search recursively in the workspace.
2. Guess compile commands from other source file in same directory or parent directory for file not included in CDB.
3. Always store absolute path in CompilationDatabase::LookupInfo::arguments, both cmake and xmake has been tested.

[Guo-Shiyu]

@gemini review

[gemini-code-assist]

Code Review

This pull request improves how compilation commands are loaded and fetched. It introduces recursive searching for compile_commands.json in the workspace and adds a mechanism to guess commands for files not in the database. The changes also include some typo fixes and minor code improvements. My review focuses on improving robustness by handling potential exceptions, ensuring deterministic behavior in the command guessing logic, and minor code style enhancements. Overall, these are good improvements to the server's functionality.

[Guo-Shiyu]

@copilot review

[Guo-Shiyu]

@gemini review

[Guo-Shiyu]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces significant improvements to how compilation commands are loaded and fetched. It adds recursive searching for compile_commands.json, guessing commands for files not in the database, and ensures include paths are absolute. The changes are well-aligned with the description and improve the robustness of the language server.

My review includes a few points:

• A critical fix for the recursive search logic for compile_commands.json.
• A high-severity fix for the command-guessing logic to prevent incorrect matches.
• A medium-severity suggestion to avoid redundant include paths in the generated commands.

Overall, this is a great enhancement. Addressing these points will make it even better.