Add nox and PEP 621 support

[nebfield]

Nox is a testing automation framework.

Test sessions are defined in noxfile.py (one per python package):

$ cd pgscatalog.core/
$ nox # run all tests and lint

While doing this I updated pyproject.toml PEP 621 support. Poetry doesn't structure its metadata in a standard way. uv is a very fast project manager that supports PEP 621.

Motivation

• Tests are now parameterised to run on all supported Python versions automatically (3.10, 3.11, and 3.12)
• Tool specific configuration files (e.g. pytest) have been deleted and migrated into the standard pyproject.toml file
• Nox will act as the entrypoint for all GitHub actions which can run tests in parallel (one per python version)

Checklist

• pgscatalog.core migrate
• pgscatalog.match migrate
• pgscatalog.calc migrate
• pgscatalog.utils migrate
• pgscatalog.validate migrate
• Update GitHub action CI
• Update GitHub action publish

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.49%. Comparing base (387a62c) to head (8d87508).
Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #61      +/-   ##
==========================================
- Coverage   90.49%   90.49%   -0.01%     
==========================================
  Files          59       58       -1     
  Lines        3798     3797       -1     
==========================================
- Hits         3437     3436       -1     
  Misses        361      361              

Flag	Coverage Δ
pgscatalog.calc	88.61% <ø> (-0.02%)	⬇️
pgscatalog.core	92.59% <ø> (ø)
pgscatalog.match	89.22% <100.00%> (ø)

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