Supporting PEP 735 dependency groups

[neutrinoceros]

I think it would make sense to eventually expose a test_groups option, similar to test_extras, to support PEP 735 Dependency Groups.

This is already supported by cibuildwheel (though unreleased at the moment, see pypa/cibuildwheel#2063).
However it's less clear when/if pip will gain support for it (see upstream issue) so it might not be possible to support this option for pure python builds yet (which would be need some work in OpenAstronomy/build-python-dist first).