Implement robust timeout mechanism

[albertvillanova]

Implement robust timeout mechanism:

• cross-platform
• thread-safe

This implementation fixes the issues from the reverted:

• Revert "Add timeout mechanism for code execution" #1340

The issues of the previous implementation were:

• not working on Windows, which does not have SIGALRM
  • See comment in: Add timeout mechanism for code execution #1318 (comment)
• not thread-safe:
  • See: [BUG] CodeAgent doesn't work in non-main threads. #1339

Key Improvements Over the Reverted Implementation

• Cross-Platform Support:

  • Uses ThreadPoolExecutor instead of signal.SIGALRM
  • Works on Windows (which doesn't have SIGALRM)

• Thread-Safe:

  • Can be called from any thread, not just the main thread
  • Creates a new executor per call to avoid threading issues

[aymeric-roucher]

Super cool, thanks!

[aymeric-roucher]

Maybe we could increase this timeout just a bit? Some tools like playwright based web search might take few seconds to run.

Or even better : rather than hardcoding this value, why make it possible to pass this as an arg to the function, since users might have different needs? In particular that would allow PythonInterpreterTool and LocalPythonExecutor to be configurable.

[albertvillanova]

Thanks a lot for your review. 🤗

I totally agree and indeed I was thinking about a follow-up PR to support this parameter being user-configurable.

But better, I will address this in this PR.