Update package infrastructure

[Cadair]

This Pull Request does a few things:

1. Configure Github releases as changelog. This configures the GitHub automatic release notes generator and a workflow to copy the release notes into the changelog when a release is made.
2. Add a config for pre-commit (lightly modified from the one in astropy core).
3. Update the config for isort
4. run pyupgrade
5. Remove setup.py and configure all the packaging in setup.cfg and pyproject.toml.

[codecov]

Codecov Report

Merging #304 (d6e01fd) into main (9e4903f) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head d6e01fd differs from pull request most recent head c2bc9e5. Consider uploading reports for the commit c2bc9e5 to get more accurate results

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
- Coverage   94.36%   94.34%   -0.02%     
==========================================
  Files          23       23              
  Lines         727      725       -2     
==========================================
- Hits          686      684       -2     
  Misses         41       41              

Impacted Files	Coverage Δ
reproject/__init__.py	100.00% <100.00%> (ø)
reproject/adaptive/core.py	92.85% <100.00%> (-0.25%)	⬇️
reproject/adaptive/high_level.py	100.00% <100.00%> (ø)
reproject/healpix/utils.py	100.00% <100.00%> (ø)
reproject/interpolation/core.py	95.74% <100.00%> (ø)
reproject/mosaicking/wcs_helpers.py	100.00% <100.00%> (ø)
reproject/spherical_intersect/core.py	97.10% <100.00%> (ø)
reproject/utils.py	80.89% <100.00%> (ø)

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[Cadair]

@astrofrog I think I have finally made this pass.

[astrofrog]

Thank you for doing all this! Just a small comment below but feel free to merge otherwise.

[bsipocz]

FYI, this PR took away reproject.test() without mentioning it in the changelog, etc.

[astrofrog]

@bsipocz Thanks for spotting this, don't think it was deliberate. How did you notice btw?

[bsipocz]

conda-forge packaging did run the user tests

[astrofrog]

Ah I see! I will check how easy it is to add back and do a patch release