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 395 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/