ensure that NaNs are handled correctly

[jo-mueller]

Fixes #39

This pull request includes changes to handle NaN values in the data property of the scatter object and its associated tests. The most important changes include updating the margin calculations to use np.nanmax and np.nanmin and adding a test case to handle NaN values.

Handling NaN values:

• src/biaplotter/artists.py: Updated margin calculations in the data property to use np.nanmax and np.nanmin instead of np.max and np.min. This ensures that NaN values are properly handled when setting the limits of the axes.

Testing NaN values:

• src/biaplotter/_tests/test_artists.py: Added a test case to handle NaN values in the on_color_indices_changed function. This test ensures that the scatter object can handle data containing NaN values without errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.26%. Comparing base (b6ebdfc) to head (f0794fb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   89.21%   89.26%   +0.04%     
==========================================
  Files           7        7              
  Lines         649      652       +3     
==========================================
+ Hits          579      582       +3     
  Misses         70       70              

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