CLN: Remove deprecated 'skip_equivalent' kwarg from transformers and 'errcheck' kwarg from CRS.from_cf

[snowman2]

• Tests updated
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #1077 (92f7c31) into main (e0b7cd0) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1077      +/-   ##
==========================================
- Coverage   96.14%   96.13%   -0.02%     
==========================================
  Files          20       20              
  Lines        1791     1785       -6     
==========================================
- Hits         1722     1716       -6     
  Misses         69       69              

Impacted Files	Coverage Δ
pyproj/crs/crs.py	98.03% <ø> (-0.01%)	⬇️
pyproj/transformer.py	94.88% <100.00%> (-0.10%)	⬇️

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