one matrix to rule them all (well, some anyways)

[altendky]

• Restructures to a single workflow for all platforms including ARM
• Update to cibuildwheel 2.7.0
• Use cibuildwheel for all wheel builds
• Build each wheel in a separate cibuildwheel call to use GitHub Actions matrixing for all dimensions
• Use pyenv for Python instead of Brew, via https://github.com/Chia-Network/actions/tree/9db4629fff0376ae272144e87ae6816179bf5fc9/setup-python
• Enable top level GitHub Actions concurrency limits
• Use https://github.com/Chia-Network/actions/tree/9db4629fff0376ae272144e87ae6816179bf5fc9/clean-workspace
• Break into multiple matrices for building wheels vs. sdist vs checks vs. uploading to PyPI
• Build sdist on Linux with Python 3.9

[cmmarslender]

lgtm

[emlowe]

good for me

[wjblanke]

aok