MNT Remove dependency on distutils

[kroq-gar78]

This should remove any explicit mentions of distutils and fix installation in Python 3.12.

I'm not super familiar with the packaging system, so there's 2 things I'm not sure about:

• Does anything else need to be done to address Refactor setup process to support Python >= 3.12 #538 ?
• Does setuptools still need to be pinned to <60.0 ? It looks like this was done to fix Installation trouble: ModuleNotFoundError: No module named 'distutils.msvccompiler' #552, but the NumPy migration docs suggest this is only if you're using numpy.distutils (which this PR removes).

[mvdoc]

This looks great! Re your questions:

1. We should just add python 3.12 to the github actions and see whether the tests run
2. I don't think we'll need to pin setuptools anymore after removing numpy.distutils

[mvdoc]

I triggered the test on python 3.12, let's see

[mvdoc]

Alright, everything is green. I tried installing locally with a new conda environment and it works great. I'll merge and release a new version.

Thanks @kroq-gar78 !