Add support for np.array in the common_nan_removal function

[nnansters]

This PR introduces the option to call the common_nan_removal function with a list of numpy arrays. When doing so you must provide the a list of integer indices for the selected_columns argument.

The existing functionality has been put into a private helper function. Then I added a function to deal with the np.array input. The existing common_nan_removal function has been turned into a wrapper for both helpers, along with some overloaded definitions for easier typing.

Also added some tests

[codecov]

Codecov Report

Attention: Patch coverage is 70.37037% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 76.52%. Comparing base (9a1760f) to head (107913f).

Files	Patch %	Lines
nannyml/base.py	70.37%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   76.53%   76.52%   -0.02%     
==========================================
  Files         110      110              
  Lines        9221     9242      +21     
  Branches     1650     1658       +8     
==========================================
+ Hits         7057     7072      +15     
- Misses       1699     1703       +4     
- Partials      465      467       +2     

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