[djhoese]

See ssec/polar2grid#823 for details.

Adds 'filter_sea_ice' which does a simple .where on Flags == 0 for quality.

Adds filter_sea_ice_quality and filter_sea_ice_swath to clear out a lot of unnecessary pixels.

I still need to confirm that both types of filtering are needed as the types of files I had were "clean" after filtering just by the quality flag (says Claude).

Code written by Claude with some edits by me.

CC @DougASchu

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.43%. Comparing base (cca42cf) to head (93bb290).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3519    +/-   ##
========================================
  Coverage   96.42%   96.43%            
========================================
  Files         474      474            
  Lines       60784    60912   +128     
========================================
+ Hits        58610    58738   +128     
  Misses       2174     2174            

Flag	Coverage Δ
behaviourtests	3.48% <0.00%> (-0.02%)	⬇️
unittests	96.51% <100.00%> (+<0.01%)	⬆️

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