make more arguments keyword only

[mathause]

This adds a helper to deprecate any number of positional arguments and deprecates some in for mask methods.

• Towards Deprecate lon_name and lat_name? #293 and leverage cf_xarray to get x_coords (lon) and y_coords (lat)? #364
• Tests added
• Passes isort . && black . && flake8
• Fully documented, including whats-new.rst

[codecov-commenter]

Codecov Report

Merging #368 (2248e37) into main (1a97d31) will decrease coverage by 0.04%.
The diff coverage is 97.43%.

❗ Current head 2248e37 differs from pull request most recent head 8df357b. Consider uploading reports for the commit 8df357b to get more accurate results

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
- Coverage   98.64%   98.59%   -0.05%     
==========================================
  Files          15       16       +1     
  Lines        1331     1357      +26     
==========================================
+ Hits         1313     1338      +25     
- Misses         18       19       +1     

Flag	Coverage Δ
bare-minimum	91.51% <97.36%> (+0.09%)	⬆️
min-all-deps	97.80% <97.36%> (-0.04%)	⬇️
unittests	98.59% <97.43%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
regionmask/core/utils.py	100.00% <ø> (ø)
regionmask/core/_deprecate.py	96.42% <96.42%> (ø)
regionmask/core/_geopandas.py	97.56% <100.00%> (+0.12%)	⬆️
regionmask/core/plot.py	100.00% <100.00%> (ø)
regionmask/core/regions.py	97.88% <100.00%> (+0.03%)	⬆️

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