More efficient StringBuilder

[MaxGraey]

I created special package for more performant StringBuilder called StringSink: https://github.com/MaxGraey/as-string-sink It still in WIP and not even tested yet but I'm really wondering how this may speedup type-off project.

[acutmore]

thanks @MaxGraey - I'll give this a go and report back. This looks like a better way of doing things compared to my naive string builder.

[MaxGraey]

Alright, package is tested, benched and published to npm: https://www.npmjs.com/package/as-string-sink