init method
Implementation
void init(AtClientImpl? clientInstance,
{Function(List<KeyLocationModel>)? streamAlternative}) async {
loggedInUserDetails = null;
atClientInstance = clientInstance;
currentAtSign = atClientInstance!.currentAtSign;
allLocationNotifications = [];
this.streamAlternative = streamAlternative;
atNotificationsController =
StreamController<List<KeyLocationModel>>.broadcast();
getAllNotifications();
loggedInUserDetails = await getAtSignDetails(currentAtSign);
getAllContactDetails(currentAtSign!);
}