Add utils.transform_resolution

[konstntokas]

• Added utils.transform_resolution to convert spatial resolution between coordinate
  reference systems (CRS) and introduced deprecation warnings for
  utils.resolution_degrees_to_meters and utils.resolution_meters_to_degrees, which
  are superseded by utils.transform_resolution.

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 (b1ce618) to head (c1cfe5f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files          20       20           
  Lines        2022     2034   +12     
=======================================
+ Hits         2001     2013   +12     
  Misses         21       21           

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[pont-us]

LGTM!