Update pyproject and add CI test to pip installation

[davide-f]

What does this PR do?

Updates pyptoject to ensure its pip installability and versioning

Tested the pip installation with:

{update earth_osm/VERSION file to desired version}
git tag {version}
python3 -m pip install build --user
python -m build
twine upload --repository testpypi dist/*
python3 -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ earth-osm=={version}
earth_osm
pip uninstall earth-osm

The proposal is to upload a post release 2.3.post1 ; expected to be done tomorrow

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.04%. Comparing base (a3a0322) to head (db6e717).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   68.17%   60.04%   -8.14%     
==========================================
  Files          16       16              
  Lines         795      906     +111     
==========================================
+ Hits          542      544       +2     
- Misses        253      362     +109     

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