feat: add bindings for BlueZ

[acolombier]

Hi @mmstick, thanks for your review. Your comments make sense for the core library, but for the example document, wouldn't it be okay to panic/use standard descriptor? Quite frankly, I spent a significant amount of time on that example already, and noticed after that other crates didn't include any example of how to use them, so if this is a blocker, I'm happy to remove the example.

[mmstick]

I guess it's OK for examples not to be perfect

[mmstick]

Thanks!