BUG: get_data_dir support for conda Windows enviroments

[snowman2]

• Closes BUG: get_data_dir support for conda Windows enviroments #1029
• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #1030 (7d00218) into main (8f0e1f7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1030   +/-   ##
=======================================
  Coverage   96.26%   96.26%           
=======================================
  Files          20       20           
  Lines        1765     1768    +3     
=======================================
+ Hits         1699     1702    +3     
  Misses         66       66           

Impacted Files	Coverage Δ
pyproj/datadir.py	100.00% <100.00%> (ø)

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