Enable trusted publishing workflow to PyPI

[clelange]

Fixes #165

I've added the workflow in PyPI and created the "release" environment following https://til.simonwillison.net/pypi/pypi-releases-from-github

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📚 Documentation preview 📚: https://hepdata-lib--256.org.readthedocs.build/en/256/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.99%. Comparing base (ee18988) to head (2adaf78).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #256   +/-   ##
=======================================
  Coverage   87.99%   87.99%           
=======================================
  Files           5        5           
  Lines        1083     1083           
  Branches      231      231           
=======================================
  Hits          953      953           
  Misses         91       91           
  Partials       39       39           

Flag	Coverage Δ
unittests-3.10	87.99% <ø> (ø)
unittests-3.6	87.68% <ø> (ø)
unittests-3.7	87.68% <ø> (ø)
unittests-3.8	87.81% <ø> (ø)
unittests-3.9	87.81% <ø> (ø)

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[clelange]

Removed tests from this since they are more complicated to set up and anyway run as part of a separate test workflow.