fix: Implement list.min and list.max for list[i128]

[lukemanley]

Also adds i128 to SIGNED_INTEGER_DTYPES which adds i128 to a number of numeric tests including test_list_min_max which this PR addresses.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.02%. Comparing base (f43a7d4) to head (b43c765).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20488   +/-   ##
=======================================
  Coverage   79.02%   79.02%           
=======================================
  Files        1563     1563           
  Lines      220596   220601    +5     
  Branches     2492     2492           
=======================================
+ Hits       174317   174334   +17     
+ Misses      45706    45694   -12     
  Partials      573      573           

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[ritchie46]

Nice one. Thanks a lot!