Implement copying python import path from opened file

[s-kai273]

Summary

This PR implements a new feature that allows users to copy the Python import path of the currently opened file to the clipboard via the file tab context menu.

What was done

• Add a context menu item to the Python file tab for copying the import path.
• Implement python.copyImportPath command.
• Implement test cases to verify the behavior under different path resolution scenarios:
  • When a sys.path entry matches the file path.
  • When no sys.path match is found but the file is within a workspace folder.
  • When neither match is found, using the filename as a fallback.

Example

For a file at /home/user/project/src/pkg/module.py and sys.path containing /home/user/project/src, the copied import path will be:

pkg.module

[s-kai273]

@microsoft-github-policy-service agree

[s-kai273]

As described here, the strategy for resolving the Python import path is as follows:

1. If the file is located under any entry in sys.path, the path relative to that entry is used.
2. If the file is located under the current workspace folder, the path relative to the workspace root is used.
3. Otherwise, the import path falls back to the file name (without extension).

I believe this approach is reasonable, but if you have any suggestions for improvement, I’d love to hear them!

[s-kai273]

I've set Ctrl+Alt+Shift+I as the default keybinding.
If you find it inconvenient or have a better suggestion, please let me know!

[s-kai273]

Hi, just a quick note regarding the CI failure:

It appears that the error is not related to the changes in this PR.
The failure seems to be caused by a build issue with the testresources package, due to an incompatibility with the latest setuptools (related to the deprecation of easy_install.sys_executable).

Please let me know if anything needs to be changed on my end. Thanks!