connect method
Implementation
Future<void> connect() async {
final channel = GrpcClientSingleton().channel;
stub = EmployeeServiceClient(channel);
employeeServiceClient = employeegrpc.EmployeeServiceClient(channel);
_hrdPreference = HrdPreference();
EmployeesStub = EmployeePermissionServiceClient(channel);
employee = (await loadCurrentEmployeeFromPrefs())!;
}