Improve huak-python-manager tooling

[cnpryer]

I really like the way uv's bootstrapping is implemented. I kinda just slapped something together, but this looks like there was more thought to it.

https://github.com/astral-sh/uv/tree/f8fbcb251809a5c712d98bf435345037393d63b7/scripts/bootstrap

It looks like huak-python-manager could probably dish out to uv one day as well.