Add on_muted and on_unmuted callbacks to RemoteMediaTrack class (#27)

[alexlapa]

Synopsis

Если сендер делает disable/enable audio/video то у ресивера стреляют on_enabled/on_disabled коллбеки. А если сендер делат mute/unmute то у ресивера ничего не стреляет. Не дело.

Solution

В RemoteMediaTrack добавляется следующий функционал:

1. fn muted() -> boolen
2. fn on_muted(callback: Function)
3. fn on_unmuted(callback: Function)

Checklist

• Created PR:
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• [x] Tests are updated (if required)
• [x] Changes conform code style
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[alexlapa]

FCM:

Add 'on_muted' and 'on_unmuted' callbacks to RemoteMediaTrack class in Jason API (#191, #27)