identify X and Y in rotated pole grids

[larsbuntemeyer]

closes #425

This PR updates criteria and regex for identifying X and Y axis in rotated pole grids.

[codecov]

Codecov Report

Merging #426 (d237087) into main (ce9cd5a) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #426      +/-   ##
==========================================
+ Coverage   86.37%   86.39%   +0.02%     
==========================================
  Files          22       22              
  Lines        3977     3983       +6     
  Branches      191      191              
==========================================
+ Hits         3435     3441       +6     
  Misses        490      490              
  Partials       52       52              

Flag	Coverage Δ
mypy	37.33% <83.33%> (+0.09%)	⬆️
unittests	96.39% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cf_xarray/criteria.py	99.05% <100.00%> (+0.05%)	⬆️
cf_xarray/tests/test_accessor.py	93.93% <100.00%> (ø)

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[dcherian]

Looks great!

[larsbuntemeyer]

Thanks for merging!