Python: Use pyproj to check CRS equality if GDAL not available

[dbaston]

Fixes #159

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 90.71%. Comparing base (f074950) to head (0c258af).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
python/src/exactextract/exact_extract.py	10.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   91.02%   90.71%   -0.32%     
==========================================
  Files          85       85              
  Lines        6432     6664     +232     
  Branches      628      629       +1     
==========================================
+ Hits         5855     6045     +190     
- Misses        545      587      +42     
  Partials       32       32              

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