Enable correct volume controls on Android during a videocall

Problem to solve

When using the volume up/and down keys the correct volume control on Android should be used.

Proposal

• https://github.com/twilio/video-quickstart-android/blob/master/exampleMultipartyVideo/src/main/java/com/twilio/examplemultipartyvideo/MultiPartyActivity.java#L167
• https://github.com/blackuy/react-native-twilio-video-webrtc/blob/master/android/src/main/java/com/twiliorn/library/CustomTwilioVideoView.java#L276
• https://github.com/blackuy/react-native-twilio-video-webrtc/blob/master/android/src/main/java/com/twiliorn/library/CustomTwilioVideoView.java#L173