Expose Rye as a Library

[haixuanTao]

Having python dependencies is hard to manage when called from other languages. If Rye could install those dependencies through a library, that would make it a lot easier to integrate python dependencies within Rust or other languages.

Issues that could be tackled:

• Simplify install scripts.
• Make the installation of the right version of python easier.
• Make dependencies more isolated and also more programmable.
• Less libpython, PYTHONPATH, LD_LIBRARY_PATH shenanigans as we could have a more reliable way to know where to find each dependencies.

This is tangential to the current vision of Rye, but would make life on planet Rust-Python a lot easier.

I can make contribute those change myself as part of rye or as a third-party lib, but just wanted to know first if that was something rye would be interested in.

[mitsuhiko]

I think this would be interesting but it's not likely that I will be working on this.