This is just to track progress on reverting this for the 1.4.0 release as it was a source of issues.

The list of PRs/things to do are:

• Add the Python implementation back with unit tests.
• Backport the fix: use the python micro version to parse whl metadata in bzlmod #2793 to the Python codebase.
• Wire the python code back for the marker evaluation.
• Wire the python code back for the deps generation.

I will be working on this one piece at a time to have steady progress.