AgoraChatEventHandler constructor
      
      AgoraChatEventHandler({ 
    
    
- required void onError(- ChatCallKitError error
 
- required void onCallEndReason(- String callId,
- ChatCallKitCallEndReason reason
 
- required VoidCallback onCallAccept,
- required void onUserRemoved(- String callId,
- String userId,
- ChatCallKitCallEndReason reason
 
- required void onAnswer(- String callId
 
Implementation
AgoraChatEventHandler({
  required this.onError,
  required this.onCallEndReason,
  required this.onCallAccept,
  required this.onUserRemoved,
  required this.onAnswer,
});