Use pyproject.toml

[tomicapretto]

Main changes

• We put all the information in pyproject.toml. This means we removed
  • requirements.txt
  • requirements-dev.txt
  • requirements-optional.txt
  • MANIFEST.in
  • setup.cfg
  • setup.py
• Make our workflows more robust, especially the release workflow.
  • Now we split the steps into build, test, and release. The first builds the source distribution. The second uploads it to TestPyPI, and the third finally uploads it to PyPI.
  • I added PYPI_TOKEN and TEST_PYPI_TOKEN secrets that are used in the workflow so we don't use personal usernames anymore.

[codecov-commenter]

Codecov Report

Merging #631 (f585226) into main (07e6f77) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
+ Coverage   86.63%   86.66%   +0.03%     
==========================================
  Files          37       37              
  Lines        2199     2205       +6     
==========================================
+ Hits         1905     1911       +6     
  Misses        294      294              

Impacted Files	Coverage Δ
bambi/version.py	100.00% <100.00%> (ø)

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[tomicapretto]

I defer approval and merging to you just in case you spot something I'm missing @canyon289 @aloctavodia

[canyon289]

LGTM. @aloctavodia deferring to you