JavaScript-TTS-Wrapper – A Node and CommonJS TTS Wrapper

Its a bit rough with SherpaOnnx and eSpeak - So PR's welcome.

Idea here is this is a unifed TTS wrapper so getVoices is the same for all engines, and bytestream is the same and word events are the same - even if they don't support it we estimate it.

Maybe useful since I see a lot of TTS hackers out there!

NB: I will say JS isnt my bag - so feedback all welcome.