Bump cibuildwheel to build for Python 3.11 + CI total time speedups

[Jackenmen]

This PR does 3 things:

• splits out the cibuildwheel run workflow into a separate workflow file that can be called from other workflows (deduplicates the pretty much identical setups in build-wheels.yml and release-wheels.yml)
• cuts the total time of the CI build in half by splitting the Linux run into concurrent jobs:
  • manylinux and musllinux x86_64 & i686 (~11 minutes)
  • manylinux aarch64 (~26 minutes)
  • musllinux aarch64 (~26 minutes)
• bumps cibuildwheel version from 2.8.1 to 2.9.0 to enable Python 3.11 builds with Python 3.11.0rc1 which is guaranteed to be ABI compatible with the final release

I wasn't entirely sure if you'll want the cibuildwheel bump done in this PR along with the changes to how the work is distributed but it's a single line change so it seemed like a reasonable idea. I can split it out into separate PR if you want me to.

[saghul]

This looks like a great improvement, thank you so much!

[Jackenmen]

No problem, I already said I wanted to improve the build time in my previous PR, just didn't want to scope creep there so I waited until that got merged and cibuildwheel 2.9.0 gets released to work on both at the same time :smile:

[Jackenmen]

I forgot to add Programming Language :: Python :: 3.11 classifier to setup.py so whenever you'll be releasing a new version, it would be great if you could add that as well because it's a nice way for sites such as https://pyreadiness.org/ to show which packages already support Python 3.11, thanks!