refactor: Add FixedSizeList equality broadcasting

[coastalwhite]

Fixes #18939.

[codecov]

Codecov Report

Attention: Patch coverage is 90.75630% with 11 lines in your changes missing coverage. Please review.

Project coverage is 79.88%. Comparing base (79fcd53) to head (3aa09af).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/polars-core/src/chunked_array/comparison/mod.rs	83.78%	6 Missing ⚠️
crates/polars-compute/src/comparisons/array.rs	95.06%	4 Missing ⚠️
crates/polars-compute/src/comparisons/list.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18967      +/-   ##
==========================================
+ Coverage   79.84%   79.88%   +0.03%     
==========================================
  Files        1523     1523              
  Lines      207302   207394      +92     
  Branches     2904     2904              
==========================================
+ Hits       165529   165683     +154     
+ Misses      41226    41164      -62     
  Partials      547      547              

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[ritchie46]

A rebase away...