ENH: Added only_best kwarg to Transformer.from_crs

[snowman2]

• Closes ENH: Add only best support  #1228
• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #1236 (ad34f1f) into main (f1fb8cd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1236   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files          20       20           
  Lines        1807     1808    +1     
=======================================
+ Hits         1740     1741    +1     
  Misses         67       67           

Impacted Files	Coverage Δ
pyproj/transformer.py	95.08% <100.00%> (+0.02%)	⬆️

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