Move to cibuildwheels

[ocefpaf]

Not ready for review yet.

[DocOtak]

Awesome, I hope this works well.

[ocefpaf]

@efiring and @DocOtak I'd love a second set of eyes here. This will move our clunky way of building wheels to the modern cibuildwheel It also builds wheels for the M1/M2 chips and the unreleased Python 3.11 (thanks to the stable API we can build wheels using the RCs now).

[DocOtak]

I grabbed the build artifacts and tested the python 3.9 and 3.10 wheels on the metal of my M1 machine (no rosetta). Everything Just Worked™, even the tests pass which I didn't expect passing given the fun in #40.

[efiring]

I tested the python3.10 wheel on macosx x86-64, and that also passes. Looks good. The only question I have at this point is why the artifacts include Python 3.6 and 3.7. I think we can drop those now.

[ocefpaf]

The only question I have at this point is why the artifacts include Python 3.6 and 3.7. I think we can drop those now.

Indeed. I left the cibuildwheels defaults there and they deprecated things a bit slower than the official deprecation. GSW in the other hand kind of follow NEP29 b/c the numpy dependency. Dropping those now.