feat: Support order-by in window functions

[ritchie46]

Could close #8662

Might lead to a fix for #14635

[codecov]

Codecov Report

Attention: Patch coverage is 84.13793% with 23 lines in your changes missing coverage. Please review.

Project coverage is 81.44%. Comparing base (616b2e0) to head (1b3e622).
Report is 1 commits behind head on main.

Files	Patch %	Lines
py-polars/src/lazyframe/visitor/expr_nodes.rs	0.00%	11 Missing ⚠️
crates/polars-plan/src/logical_plan/aexpr/mod.rs	40.00%	6 Missing ⚠️
crates/polars-plan/src/dsl/expr.rs	0.00%	2 Missing ⚠️
crates/polars-plan/src/dsl/mod.rs	85.71%	2 Missing ⚠️
crates/polars-expr/src/expressions/window.rs	93.75%	1 Missing ⚠️
crates/polars-plan/src/logical_plan/format.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16743      +/-   ##
==========================================
- Coverage   81.44%   81.44%   -0.01%     
==========================================
  Files        1413     1413              
  Lines      186199   186305     +106     
  Branches     2776     2777       +1     
==========================================
+ Hits       151654   151730      +76     
- Misses      34025    34055      +30     
  Partials      520      520              

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[Diadochokinetic]

Hi,

I saw in the code changes, that a parameter order_by_descending might be added. Are there any concrete plans for that? I am currently stuck over a problem, where I have to sort over two columns ascending and three descending. Couldn't figure out how to do that yet.