Add resolution_degrees_to_meters

[konstntokas]

• Added function utils.resolution_degrees_to_meters to convert spatial resolution
  from degrees to meters at a given geographic latitude.

Checklist:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/
• Changes documented in CHANGES.md
• CI checks pass
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.96%. Comparing base (ade49ac) to head (6d9fc08).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   98.95%   98.96%           
=======================================
  Files          20       20           
  Lines        2018     2022    +4     
=======================================
+ Hits         1997     2001    +4     
  Misses         21       21           

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