assert: improve myers diff performance

[puskin94]

fix: #57242

I reviewed the codebase and identified both some quick-win optimizations and the primary reason for the performance degradation when generating the error diff.

@Rymar, using the code example you posted in the related issue for testing during the fix, we should achieve performance levels close to what we had with the previous linear algorithm that Node.js used before switching to the Myers algorithm.

/cc @BridgeAR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.23%. Comparing base (fd45383) to head (3a76c93).
Report is 62 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57279      +/-   ##
==========================================
- Coverage   90.26%   90.23%   -0.03%     
==========================================
  Files         630      630              
  Lines      184634   184912     +278     
  Branches    36137    36180      +43     
==========================================
+ Hits       166654   166852     +198     
- Misses      11022    11063      +41     
- Partials     6958     6997      +39     

Files with missing lines	Coverage Δ
lib/internal/assert/myers_diff.js	88.88% <100.00%> (-0.50%)	⬇️

... and 52 files with indirect coverage changes

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[BridgeAR]

https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1670/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65550/

[puskin94]

                                                               confidence improvement accuracy (*)    (**)   (***)
assert/assertion-error.js datasetName='objects' size=10 n=10          ***    146.69 %      ±11.02% ±14.84% ±19.67%
assert/assertion-error.js datasetName='objects' size=10 n=200         ***    464.19 %       ±4.82%  ±6.49%  ±8.61%
assert/assertion-error.js datasetName='objects' size=10 n=50          ***    314.21 %       ±8.46% ±11.40% ±15.13%
assert/assertion-error.js datasetName='objects' size=10 n=500         ***    530.52 %       ±2.50%  ±3.37%  ±4.47%
assert/assertion-error.js datasetName='objects' size=100 n=10         ***   1137.02 %      ±14.04% ±18.92% ±25.11%
assert/assertion-error.js datasetName='objects' size=100 n=200        ***   1253.63 %      ±29.90% ±40.29% ±53.49%
assert/assertion-error.js datasetName='objects' size=100 n=50         ***   1239.92 %      ±26.41% ±35.60% ±47.26%
assert/assertion-error.js datasetName='objects' size=100 n=500        ***   1289.22 %      ±19.54% ±26.33% ±34.96%

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65605/

[nodejs-github-bot]

Landed in 395439b