Add support for polars

[kklein]

Checklist

• Added a CHANGELOG.rst entry

[codecov]

Codecov Report

Attention: Patch coverage is 88.37209% with 5 lines in your changes missing coverage. Please review.

Project coverage is 94.57%. Comparing base (acc246c) to head (8127ca9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
metalearners/_utils.py	81.81%	4 Missing ⚠️
metalearners/data_generation.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   94.73%   94.57%   -0.17%     
==========================================
  Files          15       15              
  Lines        1806     1826      +20     
==========================================
+ Hits         1711     1727      +16     
- Misses         95       99       +4     

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