check-manifest and pep621

[bjlittle]

This PR introduces MANIFEST.in checking to ensure that the PyPI source distribution and binary wheels are packaged with the expected payload.

Additionally, also applies pep-621 to modernize setuptools and migrate from the setup.cfg to pyproject.toml.

Note that, esmf is not available on PyPI, therefore a pip install esmf_regrid will require the esmf package to be installed via other means e.g., conda.

Reference:

• https://packaging.python.org/en/latest/guides/using-manifest-in/
• https://github.com/mgedmin/check-manifest
• https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#

[codecov[bot]]

Codecov Report

Merging #252 (48d1334) into main (a6853dc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   99.22%   99.22%           
=======================================
  Files          28       28           
  Lines        3102     3102           
=======================================
  Hits         3078     3078           
  Misses         24       24           

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