App & wearables: Polyrhythm support

I would like to be able to practice polyrhythms with the app, it would be good if there were some option that would allow me to listen to the different variations of polyrhythms and adjust them to my needs.

*Title: Polyrhythmic metronome

Changed the title from "Politythm metronome" to "App: Polyrhythm support"

Need this for the core too

Changed the title from "App: Polyrhythm support" to "App & wearables: Polyrhythm support"

This is a great suggestion and I can see this feature available in other apps.

Merged "Polyrhythms" #891

There's a metronome by Playback that made this feature visually appealing also. It would serve good inspiration for Soundbrenner app.

Merged "Polyrhythmic/polimetric metronome" #965

Merged "Polyrythm" #986