Coqui Bark support

[MrDiver]

Currently there is no way to use Bark using coqui because you need to specify voice_dir in the parameters and speakers can be strings. I don't quite know how i would change the Service to accomplish ease of use with this but for now you can get it to work by changing it manually in the source

Here a link for usage
https://tts.readthedocs.io/en/dev/models/bark.html#bark-model