add carton api

lib/domain/constants.dart

@@ -75,6 +75,11 @@ const carton_from_packages = "From packages";
 const carton_from_shipments = "From shipments";
 const carton_mix_box = "Mix carton";
 
+//Carton status
+const carton_packed_status = "packed";
+const carton_shipped_status = "shipped";
+const carton_delivered_status = "delivered";
+
 // shipment status
 const shipment_pending_status = "pending";
 const shipment_assigned_status = "assigned";