benchmark: add util.toUSVString()'s benchmark

[XadillaX]

I've tried to replace toUSVString()'s code with:

const surrogateRegexp = new RegExp('((?<![\ud800-\udbff])[\udc00-\udfff]|[\ud800-\udbff](?![\udc00-\udfff]))', 'g');
function toUSVString(val) {
  const str = `${val}`;
  if (!str) return str;
  return str ? str.replace(surrogateRegexp, '\ufffd') : str;
}

And run with the new benchmark:

# Pure JavaScript version
util/to-usv-string.js
util/to-usv-string.js size=10 n=100000: 1,289,465.0614219273
util/to-usv-string.js size=100 n=100000: 153,611.6972579318
util/to-usv-string.js size=500 n=100000: 31,669.01363984956

# Original version of Node.js
util/to-usv-string.js
util/to-usv-string.js size=10 n=100000: 3,030,237.0078664045
util/to-usv-string.js size=100 n=100000: 504,156.9606788727
util/to-usv-string.js size=500 n=100000: 108,351.93040720205

The original version is faster. So I decided to only add the benchmark and do not modify the implement.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/40087/

[XadillaX]

Landed in 0ee0ed1