More imperative methods (like volume) on MountedData (which should just be NodeRef)

## Specific Demand

There's a handful of DOM properties that can only be managed imperatively. Things like the document title and the `volume` setting on audio elements can only be controlled imperatively, meaning you can't modify these elements in a Desktop app.

Certain things like WebGL don't make sense to provide a bespoke API over (well, maybe something like react-three-fiber), but very simple/basic things like audio tags should be easy to control declaratively.

## Implement Suggestion

Audio Tags
- [ ] Volume

Video Tags
- [ ] Volume

cc @autarch for ideas on more DOM APIs