feat(python): Clarify to_torch "features" and "label" parameter behaviour when return type is not "dataset"

[alexander-beedie]

• Setting "label" or "features" parameters when return_type is not "dataset" now raises an informative error (previously was a silent no-op).
• Added docstring note that selectors¹ are supported for "label" and "features".

Footnotes

1. Polars selectors: https://docs.pola.rs/py-polars/html/reference/selectors.html ↩

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.94%. Comparing base (993cc99) to head (86f2552).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16218      +/-   ##
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- Coverage   80.99%   80.94%   -0.05%     
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  Files        1393     1393              
  Lines      179445   179562     +117     
  Branches     2907     2908       +1     
==========================================
+ Hits       145335   145342       +7     
- Misses      33604    33714     +110     
  Partials      506      506              

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