Optional prediction column: the return

[nnansters]

Metric classes were not able to deal with optional predictions yet.

Updated the base class and (unfortunately) added asserts to keep mypy from complaining. Didn't want that logic to leak into remove_nans

[codecov]

Codecov Report

Attention: Patch coverage is 98.03922% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 78.52%. Comparing base (e98cab9) to head (bdeac0a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
nannyml/performance_calculation/calculator.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
+ Coverage   78.41%   78.52%   +0.10%     
==========================================
  Files         110      110              
  Lines        8520     8562      +42     
  Branches     1514     1522       +8     
==========================================
+ Hits         6681     6723      +42     
  Misses       1476     1476              
  Partials      363      363              

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