Remove pkg_resources and go fully to pyproject.toml

[ChrisBarker-NOAA]

This PR removes the deprecated pkg_resources.

It also updates to a fully pyproject.toml based build / install, building off the work in: #1024

Looking now, it seems that #1039 is in fact pretty much the same thing -- wish I'd noticed that earlier!

Sorry to put two things in one PR -- I had done one, and didn't realize how much. was involved in pkg_resources.

Anyway, it would be great if either this or #1039 could be merged.

[ChrisBarker-NOAA]

Hmm -- test failing, due to bad yaml file:

Invalid workflow file: .github/workflows/default-tests.yml#L24
The workflow is not valid. .github/workflows/default-tests.yml (Line: 24, Col: 22): The expression is not closed. An unescaped ${{ sequence was found, but the closing }} sequence was not found.

I didn't touch that file, so ???

[codecov]

Codecov Report

Attention: Patch coverage is 65.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 80.69%. Comparing base (c137e28) to head (2f9c5ae).
Report is 7 commits behind head on develop.

Files	Patch %	Lines
compliance_checker/cf/util.py	33.33%	2 Missing ⚠️
compliance_checker/suite.py	77.77%	2 Missing ⚠️
cchecker.py	0.00%	1 Missing ⚠️
compliance_checker/base.py	66.66%	0 Missing and 1 partial ⚠️
compliance_checker/cfutil.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1059      +/-   ##
===========================================
- Coverage    82.14%   80.69%   -1.46%     
===========================================
  Files           24       25       +1     
  Lines         5170     5267      +97     
  Branches      1242     1261      +19     
===========================================
+ Hits          4247     4250       +3     
- Misses         623      716      +93     
- Partials       300      301       +1     

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[jcermauwedu]

Using importlib.metadata.entry_points(group= forces the minimum python to 3.10. I was struggling in python 3.9. The workflow default-tests.yml may need to drop 3.8 and 3.9. I will wait for this PR to continue with the pytest fixes in #1056.

[ChrisBarker-NOAA]

Now that #1039 has been merged, I'm going to update this. closing for now.

Thanks for the 3.10 hint -- that's where I was testing, but it wasn't clear from the docs which features were added when to the stdlib. I'll use the backported version for older versions.

[ChrisBarker-NOAA]

OK -- here it is: #1060