refactor(python): Deprecate explicit Categorical physical ordering

[ritchie46]

No description provided.

[orlp]

You left half a sentence here.

[Shoeboxam]

Will dropping ordering affect .cut(...).to_physical(), where the order of categories coming out of cut is significant?

[codecov]

Codecov Report

Attention: Patch coverage is 98.49624% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.93%. Comparing base (2c9e503) to head (5692b8d).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...rates/polars-plan/src/plans/optimizer/set_order.rs	98.09%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19055      +/-   ##
==========================================
+ Coverage   78.91%   78.93%   +0.02%     
==========================================
  Files        1567     1561       -6     
  Lines      219928   219804     -124     
  Branches     2465     2471       +6     
==========================================
- Hits       173549   173505      -44     
+ Misses      45811    45731      -80     
  Partials      568      568              

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