Add support for buffer.isUtf8

[JMTK]

Is there an existing issue for this?

• I've searched for any related issues and avoided creating a duplicate issue.

Description

New feature in Node 19.4:
https://nodejs.org/dist/latest-v19.x/docs/api/buffer.html#bufferisutf8input

Tested it locally doing something like this. I haven't fully performance tested. I can open a PR if you're open to the idea

const buffer = require('node:buffer');
// ...
/* istanbul ignore else  */
if (!process.env.WS_NATIVE_UTF8_VALIDATE && typeof buffer.isUtf8 === 'function') {
  try {
    console.log("Using native Utf8!");
    module.exports.isValidUTF8 = buffer.isUtf8;
  } catch (e) {
    // Continue regardless of the error.
  }
}
else if (!process.env.WS_NO_UTF_8_VALIDATE) {
  try {
    const isValidUTF8 = require('utf-8-validate');

    module.exports.isValidUTF8 = function (buf) {
      return buf.length < 150 ? _isValidUTF8(buf) : isValidUTF8(buf);
    };
  } catch (e) {
    // Continue regardless of the error.
  }
}

and it seemed to work ok

ws version

8.11.0

Node.js Version

19.4.0

System

N/A

Expected result

N/A

Actual result

N/A

Attachments

Testing on my Discord bot

Ran all tests:

[lpinca]

Yes, I will add it soon. See websockets/utf-8-validate#101 (comment) for benchmarks. Buffer.isUtf8() has the same performance of utf-8-validate@6.