Migrate to pyproject.toml

[tekktrik]

Changes for migrating from setup.py to pyproject.toml. Changes include:

• Migratation from setup.py to pyproject.toml
• Remove ez_setup.py because pyproject.toml handles downloading build dependencies (setuptools)
• Also therefore removes ez_setup as a module
• Updates workflow files
• Builds a pure Python wheel for PyPI upload, along with the source distribution

Resolves #143

[brentru]

@tekktrik Could you also update the "manual installation" section of the README to add instructions for manually installing Adafruit IO Python after this migration?

https://github.com/adafruit/Adafruit_IO_Python#manual-installation

[tekktrik]

Yup! PR already includes the updated manual installation command! Additional change is that CI takes care of updating version strings, by the way. Manual installs will be version 0.0.0.

[tekktrik]

@brentru let me know if any additional changes are needed

[ofek]

Hey! What do we think about using the build backend hatchling (of which I am a maintainer in the PyPA) as that is now the default in the official Python packaging tutorial. Hatchling is available on all the major distribution channels such as Debian, Fedora, Arch Linux, conda-forge, Nixpkgs, Alpine Linux, FreeBSD, Gentoo Linux, MacPorts, OpenEmbedded, Spack, etc.

[tekktrik]

My personal vote would be to transition to a setuptools backend to match the few hundred libraries we just migrated to be that so they all match. If we want to transition all of these in the future that's worth exploring, but probably out of scope for this PR, which is just to move away from setup.py.

[tekktrik]

@brentru I think I might have fixed the previous issue, so just need approval for the CI again

[tekktrik]

@brentru is anything still needed before CI run?

[tekktrik]

@brentru is this good to run?

[tekktrik]

I think I'll continue to touch this up when I have a little more time, but closing in the meantime.