Add textToSpeech Command

[XtremeOwnageDotCom]

https://www.fully-kiosk.com/en/#configuration

[cgarwood]

We need to at minimum pass the text parameter along, but support for locale and engine would be good to include as well

[XtremeOwnageDotCom]

Added parameters. (Might double-check to ensure the logic is correct.)

I have not spent too much time looking at how this library is configured- I am mostly just trying to mimic some of the other configured endpoints-

The origin of this request came from my TTS functionality not working directly from home assistant. After spending a few hours, I ended up reverting to just calling the rest-api directly.

If/when this PR was merged, the next part would be to update your integration on the home-assistant side to actually expose this as a service. But, since, the home-assistant integration references this particular library- this PR was a prerequisite.