src: use simdutf for two-byte string utf8 conversion in utf8 value

[mertcanaltin]

latin-1 already used simdutf #61696,

I changed WriteUtf8V2 to simdutf for two-byte strings.

➜ node git:(mert/use-simdutf-for-two-byte-utf8) ✗ node-benchmark-compare ./result.csv
confidence improvement accuracy (*) (**) (***)
util/utf8-value.js n=5000000 type='ascii' -0.11 % ±2.64% ±3.69% ±5.18%
util/utf8-value.js n=5000000 type='mixed'*** 49.60 % ±1.90% ±2.67% ±3.78%
util/utf8-value.js n=5000000 type='three_bytes'*** 31.10 % ±2.42% ±3.34% ±4.60%
util/utf8-value.js n=5000000 type='two_bytes'*** 42.75 % ±1.42% ±1.94% ±2.66%
Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 4 comparisons, you can thus expect the following amount of false-positive results:
0.20 false positives, when considering a 5% risk acceptance (*, **, ***),
0.04 false positives, when considering a 1% risk acceptance (**, ***),
0.00 false positives, when considering a 0.1% risk acceptance (***)

[nodejs-github-bot]

Review requested:

• @nodejs/performance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.68%. Comparing base (da5843b) to head (19f636f).
⚠️ Report is 1305 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #62248 +/- ##
==========================================
+ Coverage 89.67% 89.68% +0.01% 
==========================================
Files 676 676 Lines 206469 206700 +231 Branches 39537 39584 +47 ==========================================
+ Hits 185157 185388 +231 + Misses 13448 13441 -7 - Partials 7864 7871 +7 

Files with missing lines	Coverage Δ
src/util.cc	87.64% <100.00%> (+0.20%)	⬆️

... and 52 files with indirect coverage changes

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[lemire]

this look fine, see my comment.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/72570/

[github-actions]

This pull request has been marked as stale due to 90 days of inactivity.
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