ENH: Added authority, accuracy, and allow_ballpark kwargs to TransformerGroup

[snowman2]

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

[codecov]

Codecov Report

Merging #1076 (a9395d1) into main (659852e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1076   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files          20       20           
  Lines        1791     1791           
=======================================
  Hits         1722     1722           
  Misses         69       69           

Impacted Files	Coverage Δ
pyproj/transformer.py	94.97% <ø> (ø)

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