RealtimeObserver
@objc
public protocol RealtimeObserverRealtimeObserver handles event that happens in realtime,
 such as delta in attendees join or leave, volume/signal status.
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                  Handles volume changes for attendees Note: this callback will be called on main thread. DeclarationSwift func volumeDidChange(volumeUpdates: [VolumeUpdate])ParametersvolumeUpdatesAn array of VolumeUpdates 
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                  Handles signal strength changes for attendees Note: this callback will be called on main thread. DeclarationSwift func signalStrengthDidChange(signalUpdates: [SignalUpdate])ParameterssignalUpdatesAn array of SignalUpdates 
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                  List attendees that are newly added to the meeting Note: this callback will be called on main thread. DeclarationSwift func attendeesDidJoin(attendeeInfo: [AttendeeInfo])ParametersattendeeInfoan array of AttendeeInfo added 
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                  List attendees that left the meeting Note: this callback will be called on main thread. DeclarationSwift func attendeesDidLeave(attendeeInfo: [AttendeeInfo])ParametersattendeeInfoan array of AttendeeInfo who left 
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                  List attendees that got dropped from the meeting due to network Note: this callback will be called on main thread. DeclarationSwift func attendeesDidDrop(attendeeInfo: [AttendeeInfo])ParametersattendeeInfoan array of AttendeeInfo who are dropped 
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                  List attendees that are newly muted in the meeting Note: this callback will be called on main thread. DeclarationSwift func attendeesDidMute(attendeeInfo: [AttendeeInfo])ParametersattendeeInfoan array of AttendeeInfo newly muted 
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                  List attendees that newly unmuted from the meeting Note: this callback will be called on main thread. DeclarationSwift func attendeesDidUnmute(attendeeInfo: [AttendeeInfo])ParametersattendeeInfoan array of AttendeeInfo newly unmuted 
