Add QC filtering to the WSPD variable for AMSR2 L2 GAASP

[djhoese]

While testing things for Polar2Grid @kathys noticed that the AMSR2 GAASP algorithm's "OCEAN" files don't seem to have as much quality filtering for the "WSPD" variable like many of the other variables do. This PR adds an optional flag (off by default) to use "WSPD_QC" to convert bad quality pixels to NaN. From what we can tell the QC variables in the GAASP output are inconsistent so a generic solution didn't seem feasible.

• 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 96.34%. Comparing base (b0e6693) to head (4597879).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3332   +/-   ##
=======================================
  Coverage   96.33%   96.34%           
=======================================
  Files         463      463           
  Lines       58926    58970   +44     
=======================================
+ Hits        56769    56813   +44     
  Misses       2157     2157           

Flag	Coverage Δ
behaviourtests	3.59% <0.00%> (-0.01%)	⬇️
unittests	96.43% <100.00%> (+<0.01%)	⬆️

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[pnuu]

Example how the filtering is turned on would be nice.

[djhoese]

🤦 of course. I'll add that when I'm back at my computer.

[coveralls]

Pull Request Test Coverage Report for Build 21751520498

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.003%) to 96.422%

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Files with Coverage Reduction	New Missed Lines	%
readers/amsr2_l2_gaasp.py	10	93.9%

Totals
Change from base Build 21639130981:	0.003%
Covered Lines:	56693
Relevant Lines:	58797

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💛 - Coveralls

[djhoese]

Updating from the conversation on slack: Martin approved of the PR but wanted real files to be used in the tests. This has been implemented and some things refactored. Merging now...