perf: Improve binview extend/ifthenelse

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 73.01587% with 17 lines in your changes missing coverage. Please review.

Project coverage is 80.35%. Comparing base (c8fde41) to head (ba3b22e).
Report is 48 commits behind head on main.

Files	Patch %	Lines
crates/polars-compute/src/if_then_else/view.rs	59.52%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18164      +/-   ##
==========================================
+ Coverage   80.32%   80.35%   +0.03%     
==========================================
  Files        1496     1496              
  Lines      197871   197863       -8     
  Branches     2822     2822              
==========================================
+ Hits       158930   158990      +60     
+ Misses      38419    38351      -68     
  Partials      522      522              

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