feat: let rolling accept index_column of type UInt32 or UInt64

[MarcoGorelli]

closes #7360

This one's been bugging me for a while, not being able to just do df.with_row_index().rolling("index", period="2i") and instead having to do df.with_row_index().rolling(pl.col("index").cast(pl.Int64), period="2i")

The result index should be the same as the input, so the cast back to an unsigned integer should always work without surprises

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.78%. Comparing base (849953b) to head (95a0f8e).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14669      +/-   ##
==========================================
- Coverage   80.79%   80.78%   -0.01%     
==========================================
  Files        1326     1326              
  Lines      173249   173249              
  Branches     2456     2456              
==========================================
- Hits       139976   139963      -13     
- Misses      32800    32813      +13     
  Partials      473      473              

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[ritchie46]

Yeap, easy enough. :)