feat: Show warning if expressions are very deep

[ritchie46]

closes #16225

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 80.86%. Comparing base (15f6b36) to head (ead377d).

Files	Patch %	Lines
...ates/polars-lazy/src/physical_plan/planner/expr.rs	93.25%	6 Missing ⚠️
py-polars/polars/config.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16233   +/-   ##
=======================================
  Coverage   80.85%   80.86%           
=======================================
  Files        1394     1394           
  Lines      179955   180030   +75     
  Branches     2909     2911    +2     
=======================================
+ Hits       145508   145579   +71     
- Misses      33942    33946    +4     
  Partials      505      505           

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