fix(devices): API to disable speaking while muted notifications

A joint PR that fixes a couple of related issues:

Adds an API that disables speaking while muted notifications - fixes #1329
The selected device can't be reliably detected when audio or video filters are used
Audio tracks are now stopped (instead of disabled) on the Web - this should release the mic allocation
Fixed an issue in usePersistedDevicePreferences() where the camera and mic were automatically enabled after a call had been left
Pronto and Video Demo now remember the last used video filter and they enable it automatically

GetStream / stream-video-js