feat: build wheels for linux, windows, mac using cibuildwheel

[leocov-dev]

I'd like to be able to easily use this library on macOS and windows but without published wheels it is difficult. To that end I've added a github actions workflow that uses cibuildwheel to create wheels for a variety of platforms/architectures. cibuildwheels is a well established project for building wheels used by many large projects (see links). https://github.com/pypa/cibuildwheel https://cibuildwheel.pypa.io/en/stable/working-examples/ In addition to building wheels it runs the test suite on all the wheels it creates. example of workflow running (can inspect generated artifacts): https://github.com/leocov-dev/blurhash-python/actions/workflows/ci.yml

changes:

• cibuildwheels action workflow
• publish workflow for PyPi
• convert setup.py to pyproject.toml
• update tests to work in CI