Re: [mediacapture-output] API to request audio output device selection (#86)

I think we should discuss the persistency in a follow-up discussion.
We may be able to provide some persistency similarly to what I described at the last interim for setSinkId: 
- We add an optional sinkId parameter to the requestAudioOutputDevice method.
- If it is present and the ID does not refer to anything, prompt the user
- Otherwise, we could prompt the user with preselected entry or we could resolve without even prompting the user (this device then shows up in enumerateDevices and can be used by setSinkId)


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