FIX sample_mask cannot mask nan from feature generators

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: fix BUG sample_mask in LazyFastCan cannot mask invalid data given by feature generator #256
• A description of the changes:

1. make sample_mask also mask nan from feature generator
2. add test to check this issue

[MatthewSZhang]

Intersphinx error when fetching SciPy docs

See scipy/docs.scipy.org#102 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1966466) to head (25d594c).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #257   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines         1000      1002    +2     
=========================================
+ Hits          1000      1002    +2     

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