Migrate dependency management to PEP 735 + Add sphinx build CI check

[Avasam]

https://peps.python.org/pep-0735/

A nice side effect of this is that using uv sync for local development now properly automatically picks-up development dependencies, and you don't leak your dev dependencies as an extra.

Added sphinx build CI check to help prevent breakage. Also done in #100

[Avasam]

@Kalmat I think you should enable Build pull requests for this project in https://app.readthedocs.org/dashboard/pywinctl/edit/

For PRs to validate ReadTheDocs

See: https://docs.readthedocs.com/platform/stable/pull-requests.html

[Kalmat]

HI! It's a long long time no see you!

I've been out for a long long time too, sorry

I have enabled that option. Not sure what it means, but I fully trust your criteria.

Thanks!

[Avasam]

Been a while indeed, you basically see me anytime I plan an upgrade to AutoSplit that involves PyWinCtl :P (or if you need me for any static typing issue).

I have enabled that option. Not sure what it means, but I fully trust your criteria.

It adds this check !