feat: Extend allowed types of the categories arg of dy.Enum

[jjurm]

Motivation

This makes the categories argument accept the same types as in pl.Enum, making it easier to convert from polars dtypes to dataframely dtypes.

Fixes #136.

Changes

dy.Enum.categories is now stored as a pl.Series - happy to think of another solution if you don't think we should convert all sequences to series. However, this is what polars does internally anyway once dy.Enum.dtype is called.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f303b3b) to head (3c03c14).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #138   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           49        49           
  Lines         2812      2818    +6     
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+ Hits          2812      2818    +6     

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[borchero]

Neat, looks great, thanks @jjurm! I think it's fine to represent the categories as series, I can't come up with a downside and we mirror the polars API this way. Would love to hear a second opinion on this by @AndreasAlbertQC or @delsner though 😄

[AndreasAlbertQC]

Thanks for the PR @jjurm! Personally, I'd have gone for list, but I also don't think it's super important 🤷

[AndreasAlbertQC]

Let's go!