feat: Use hatchling as the build backend

[matthewfeickert]

To be able to achieve ssl-hep/ServiceX_frontend#352 all dependencies need to be on conda-forge as well. conda-forge requires that all distributions also package their LICENSE file, and conda-forge builds the distributions from either Git source code or (preferably) a sdist on PyPI. make-it-sync's sdist doesn't include the LICENSE file

$ python -m pip download --no-binary make-it-sync make-it-sync
Collecting make-it-sync
  Downloading make-it-sync-1.0.0.tar.gz (3.5 kB)
  Preparing metadata (setup.py) ... done
Saved ./make-it-sync-1.0.0.tar.gz
Successfully downloaded make-it-sync
$ python -m tarfile --list make-it-sync-1.0.0.tar.gz 
make-it-sync-1.0.0/ 
make-it-sync-1.0.0/PKG-INFO 
make-it-sync-1.0.0/README.md 
make-it-sync-1.0.0/make_it_sync/ 
make-it-sync-1.0.0/make_it_sync/__init__.py 
make-it-sync-1.0.0/make_it_sync/func_wrapper.py 
make-it-sync-1.0.0/make_it_sync.egg-info/ 
make-it-sync-1.0.0/make_it_sync.egg-info/PKG-INFO 
make-it-sync-1.0.0/make_it_sync.egg-info/SOURCES.txt 
make-it-sync-1.0.0/make_it_sync.egg-info/dependency_links.txt 
make-it-sync-1.0.0/make_it_sync.egg-info/requires.txt 
make-it-sync-1.0.0/make_it_sync.egg-info/top_level.txt 
make-it-sync-1.0.0/setup.cfg 
make-it-sync-1.0.0/setup.py 

As this requires making a new release that includes LICENSE information, I updated the build backend from setuptools+distutils to hatchling.

@gordonwatts If this all looks acceptable, after this is merged could you make a v0.2.0 (minor as this drops Python 3.6 as it is very EOL) release on PyPI?

[gordonwatts]

I've never used hatch - it is like there is a new tool every 10 days and I don't know how you keep switching Matthew - it feels like it takes too much time! But this is a great upgrade - a toml file! Thank you so much!!!!!

[matthewfeickert]

I've never used hatch - it is like there is a new tool every 10 days and I don't know how you keep switching

I switched once when we moved to hatch/hatchling for pyhf and I'm staying until I need compiled dependencies or someone gives me a very good argument to change! :P

[matthewfeickert]

Also thanks for being super speedy with a v2.0.0 release! 🚀