config method
Implementation
void config({required JoinInfo meetingData}) {
_instance.meetingData = meetingData;
var attendeeId = meetingData.attendee.attendeeId;
localAttendeeId.add(attendeeId);
_updateCurrentAttendee(
AttendeeModel(attendeeId, meetingData.attendee.externalUserId));
methodChannelProvider.initializeObservers(MeetingModel());
}