Add JOSS paper

[hajdik]

Purpose

Bring the paper branch into main as the review is nearly complete. Also bump the version and add a metadata file for the zenodo build to pick up on.

Expected time until merged

A day or two so we can do a final proofread

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (final paper!)

Testing

PDF can be viewed here

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #203 (18ef1e8) into main (4f18d04) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #203   +/-   ##
=======================================
  Coverage   64.76%   64.76%           
=======================================
  Files          47       47           
  Lines       12018    12018           
=======================================
  Hits         7783     7783           
  Misses       4235     4235           

Impacted Files	Coverage Δ
pygeo/__init__.py	100.00% <100.00%> (ø)

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[sseraj]

I left some minor comments

[ewu63]

LGTM other than two minor things. Once fixed (and required approvals are obtained) we can remove the GHA file, and merge.

[ewu63]

LGTM, don't forget to make a release after merged!