ENH: Added Transformer.get_last_used_operation

[snowman2]

• Closes ENH: Transformer get operation used in transform #1071
• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #1124 (18de154) into main (f7f4c25) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1124   +/-   ##
=======================================
  Coverage   96.15%   96.16%           
=======================================
  Files          20       20           
  Lines        1795     1797    +2     
=======================================
+ Hits         1726     1728    +2     
  Misses         69       69           

Impacted Files	Coverage Δ
pyproj/transformer.py	94.95% <100.00%> (+0.04%)	⬆️

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