Add runtime docstrings to stubs in release wheels

[jonathanberthias]

The bundled type stubs contain no docstrings, so editors using them can miss the documentation available on the compiled extension.

This PR copies existing runtime docstrings into the stubs during release wheel builds using docstring-adder. It runs after native libraries are bundled and repacks the wheel with updated file hashes. This applies to Python 3.10 and later, as required by docstring-adder.

The implementation was generated with AI assistance.

Part of #1072

[Joao-Dionisio]

The implementation was generated with AI assistance.

Thank you so much for the disclosure, @jonathanberthias ! I'm assuming you reviewed the changes already, correct?

[jonathanberthias]

Thank you so much for the disclosure, @jonathanberthias ! I'm assuming you reviewed the changes already, correct?

I ran the build workflow on my fork and it seems to work, but I know very little about cibuildwheel so perhaps there's a better way. This was done by Sol 6.1, maybe if you have access to other models they can come up with different ideas 🤷