Feature/geo as optional dependency

[sandorkertesz]

This PR makes earthkit-geo an optional dependency. To install it we need to use:

pip install earthkit-data[geo]

It is also installed with:

pip install earthkit-data[all]

earthkit-geo is currently only used for the Field.points_unrotated() method.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (e7ce5e7) to head (9b8b39e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #569      +/-   ##
===========================================
- Coverage    90.14%   89.89%   -0.26%     
===========================================
  Files          149      149              
  Lines        10972    10975       +3     
  Branches       519      519              
===========================================
- Hits          9891     9866      -25     
- Misses         914      942      +28     
  Partials       167      167              

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