perf(collections): optimize minBy/maxBy with fast array paths

[tomas-zijdemans]

Optimize minBy and maxBy performance by:

• Adding an array fast path that uses index-based iteration instead of iterators
• Extracting the first element to remove the undefined check from the hot loop

Benchmarks show improvements ranging from ~7% for generators to ~4x for small arrays, with most array operations seeing ~1.3-2x improvement.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.18%. Comparing base (13e5527) to head (0f16b94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6919      +/-   ##
==========================================
+ Coverage   94.17%   94.18%   +0.01%     
==========================================
  Files         584      584              
  Lines       43087    43127      +40     
  Branches     6875     6891      +16     
==========================================
+ Hits        40578    40621      +43     
+ Misses       2457     2455       -2     
+ Partials       52       51       -1     

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