refactor: Expose and rewrite 'can_pre_agg'

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 98.24561% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.98%. Comparing base (a6fffd4) to head (3e325ef).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-plan/src/plans/aexpr/utils.rs	98.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20450      +/-   ##
==========================================
- Coverage   79.00%   78.98%   -0.02%     
==========================================
  Files        1563     1563              
  Lines      220449   220557     +108     
  Branches     2488     2488              
==========================================
+ Hits       174157   174205      +48     
- Misses      45719    45779      +60     
  Partials      573      573              

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