Added support for 3D conservative resampling to regridding.weights().

[roytsmart]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.44737% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.12%. Comparing base (c63b174) to head (8258371).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...eights_conservative_3d/_weights_conservative_3d.py	80.33%	58 Missing ⚠️
regridding/_weights/_weights_conservative.py	20.00%	4 Missing ⚠️
...idding/_weights/_weights_conservative_3d/_grids.py	99.50%	1 Missing ⚠️
...g/_weights/_weights_conservative_3d/_intercepts.py	99.22%	1 Missing ⚠️
...ights/_weights_conservative_3d/_intercepts_test.py	97.05%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   89.25%   90.12%   +0.86%     
==========================================
  Files          26       35       +9     
  Lines        1377     2156     +779     
==========================================
+ Hits         1229     1943     +714     
- Misses        148      213      +65     

Flag	Coverage Δ
unittests	90.12% <91.44%> (+0.86%)	⬆️

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