assert: make myers_diff function more performant

[puskin94]

now that Myers diff has landed, I took the liberty to review the code I wrote to look for improvements that would squeeze some more performance out of the comparison mechanism

• simplified some logic
• reviewed loops and introduced more breaking points to make them run for less cycles
• reduced memory allocation using Int32Array

Refs: #54862

[codecov]

Codecov Report

Attention: Patch coverage is 82.85714% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.54%. Comparing base (0d00511) to head (f719438).

Files with missing lines	Patch %	Lines
lib/internal/assert/myers_diff.js	82.85%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #56303      +/-   ##
==========================================
+ Coverage   88.04%   88.54%   +0.50%     
==========================================
  Files         657      657              
  Lines      190290   190298       +8     
  Branches    36245    36538     +293     
==========================================
+ Hits       167536   168504     +968     
+ Misses      15893    14986     -907     
+ Partials     6861     6808      -53     

Files with missing lines	Coverage Δ
lib/internal/assert/myers_diff.js	89.14% <82.85%> (-0.68%)	⬇️

... and 93 files with indirect coverage changes