[Feature] add support for the new NVDA Controller Client

[Timtam]

Hello there,

i'm using this crate through bevy_tts right now. One thing that came to mind was to support the new NVDA Controller Client which recently got support for feedback on e.g. when speech stopped. They do have a dedicated Rust example in the repo too: https://github.com/nvaccess/nvda/tree/master/extras/controllerClient/examples/example_rust

I think it could be really neat to have support in here too so that everyone could use the advanced features of the new NVDA Controller Client through tts-rs.