Deprecate path parameter for saving to netcdf

[aazuspan]

For simplicity, this deprecates the path parameter to the to_xarray methods. Instead, users can directly access the to_netcdf method in xarray.

[codecov-commenter]

Codecov Report

Merging #67 (4fdaec8) into main (5bcffe2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   97.42%   97.44%   +0.01%     
==========================================
  Files          20       20              
  Lines        1050     1055       +5     
==========================================
+ Hits         1023     1028       +5     
  Misses         27       27              

Impacted Files	Coverage Δ
wxee/collection.py	100.00% <100.00%> (ø)
wxee/image.py	91.46% <100.00%> (+0.21%)	⬆️

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