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src: improve utf8 string generation performance

Rodrigo Muino Tomonari requested to merge github/fork/anonrig/speed-up-utf8value into main

This speeds up Utf8Value across all Node.js codebase. We add a fast path for one byte strings and use the new V8 API (String::ValueView) with simdutf for non-byte strings. Once simdutf supports null termination and invalid character replacement, we can improve the performance more.

cc @nodejs/performance @lemire

Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1637/

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