Add overload support to partition_by.

[ghuls]

No description provided.

[ritchie46]

Thanks a lot! I was very frustrated about this ^^

[codecov-commenter]

Codecov Report

Merging #3388 (2465003) into master (47b060c) will increase coverage by 0.00%.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master    #3388   +/-   ##
=======================================
  Coverage   77.41%   77.41%           
=======================================
  Files         394      394           
  Lines       68525    68534    +9     
=======================================
+ Hits        53048    53057    +9     
  Misses      15477    15477           

Impacted Files	Coverage Δ
py-polars/polars/internals/frame.py	88.77% <75.00%> (-0.20%)	⬇️
polars/polars-lazy/src/logical_plan/aexpr.rs	80.72% <0.00%> (-0.61%)	⬇️
polars/polars-core/src/series/from.rs	70.28% <0.00%> (-0.49%)	⬇️
...olars/polars-core/src/frame/groupby/into_groups.rs	53.84% <0.00%> (-0.37%)	⬇️
polars/polars-core/src/vector_hasher.rs	75.00% <0.00%> (-0.27%)	⬇️
polars/polars-lazy/src/logical_plan/conversion.rs	80.21% <0.00%> (-0.14%)	⬇️
...lars/polars-core/src/chunked_array/ops/sort/mod.rs	92.12% <0.00%> (+0.17%)	⬆️
polars/polars-core/src/datatypes.rs	69.26% <0.00%> (+0.19%)	⬆️
polars/polars-core/src/chunked_array/mod.rs	87.73% <0.00%> (+0.21%)	⬆️
polars/polars-core/src/series/mod.rs	58.13% <0.00%> (+0.41%)	⬆️
... and 3 more

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