Support gridspec for 0.05x0.05 latlon

[sandorkertesz]

Description

This PR enables earthkit-regrid (earthkit-regrid >= 0.4.1 is required) to interpolate GRIB fieldlists to 0.05x0.05 degree global latitude-longitude grid

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.67%. Comparing base (66cddef) to head (5be715d).
⚠️ Report is 257 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #803      +/-   ##
==========================================
- Coverage   90.02%   85.67%   -4.36%     
==========================================
  Files         158      172      +14     
  Lines       12086    13177    +1091     
  Branches      593      637      +44     
==========================================
+ Hits        10881    11289     +408     
- Misses       1023     1698     +675     
- Partials      182      190       +8     

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