UpdateGroupCallParticipant.fromJson constructor
Parse from a json
Implementation
factory UpdateGroupCallParticipant.fromJson(Map<String, dynamic> json) =>
    UpdateGroupCallParticipant(
      groupCallId: json['group_call_id'],
      participant: GroupCallParticipant.fromJson(json['participant']),
      extra: json['@extra'],
      clientId: json['@client_id'],
    );