Add LocalMediaTrack.on_audio_level_changed() callback

[rogurotus]

Synopsis

Adds an API for tracking the audio level of local tracks

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[rogurotus]

FCM

Add `LocalMediaTrack.on_audio_level_changed()` callback (#167)

[tyranron]

@evdokimovs we have this no-op on Web. Is it intended to be implemented in a separate PR or impossible at all?

[evdokimovs]

@tyranron ,

@evdokimovs we have this no-op on Web. Is it intended to be implemented in a separate PR or impossible at all?

It is possible to implement this feature using Web Audio API. We can do it later, but I think that it's a low priority feature at this moment.

[tyranron]

@evdokimovs regarding the priority - OK, but add it backlog, please, to not forget about it.