ENH: Added PoleRotationNetCDFCFConversion

[snowman2]

• Closes ENH: Add PoleRotationNetCDFConversion #948
• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #978 (eadfce7) into master (75f1edc) will decrease coverage by 0.09%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #978      +/-   ##
==========================================
- Coverage   96.24%   96.14%   -0.10%     
==========================================
  Files          20       20              
  Lines        1758     1765       +7     
==========================================
+ Hits         1692     1697       +5     
- Misses         66       68       +2     

Impacted Files	Coverage Δ
pyproj/crs/coordinate_operation.py	98.26% <71.42%> (-1.74%)	⬇️
pyproj/crs/_cf1x8.py	98.69% <100.00%> (ø)

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