Fix EWA ll2cr not handling non-C contiguous arrays

[djhoese]

CC @ameraner

In #723 it was pointed out that non-C contiguous lon/lat inputs to the EWA ll2cr function are not handled. This PR fixes this by specifying the order kwarg to astype as well as using numpy.require to force write-ability on the inputs. I think this preserves the existing functionality while handling more use cases.

The main complication here is that old ll2cr has an optimization if some users want to use it where results are written in-place on the lon/lat inputs to avoid making extra arrays. This of course completely overwrites the lon/lat data in the arrays and is why the default is to copy the data, but I'd still like to support this behavior if it can be used in the future.

• Closes EWA resampler fails (with METimage/VII data) with non-contiguous lonlat arrays #723
• Tests added
• Tests passed
• Fully documented

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.68%. Comparing base (3b1287b) to head (6592fb9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #725      +/-   ##
==========================================
+ Coverage   93.66%   93.68%   +0.02%     
==========================================
  Files          89       89              
  Lines       13707    13711       +4     
==========================================
+ Hits        12838    12845       +7     
+ Misses        869      866       -3     

Flag	Coverage Δ
unittests	93.68% <100.00%> (+0.02%)	⬆️

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[ameraner]

Thank you very much for the quick fix! It solves my issue.