Use optional keyword arguments for subset

[wx4stg]

Allows subsetting without requiring all arguments. Backwards compatible with original behavior.

If a filter is provided without providing the relevant data array, an error is raised.

If the data arrays are not the same shape, an error is raised

Filters and data for the time variable are cast to numpy datetime64 first to allow, e.g., subsetting an array of numpy datetime64 using a filter of datetime objects.

Fixes #39

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 83.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.34%. Comparing base (97f8aaa) to head (e246fbc).

Files with missing lines	Patch %	Lines
pyxlma/plot/xlma_plot_feature.py	83.33%	8 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   73.20%   73.34%   +0.14%     
==========================================
  Files          16       16              
  Lines        2086     2127      +41     
==========================================
+ Hits         1527     1560      +33     
- Misses        559      567       +8     

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