fetch item prices - throttle end points with promise queue

app/model/item.ts

@@ -1,6 +1,10 @@
+import { IItemPrice } from './item-price';
+
 export interface IItem {
   category: any[];
+  corrupted: boolean;
   descrText: string;
+  elder: boolean;
   explicitMods: string[];
   frameType: number;
   h: number;
@@ -8,10 +12,15 @@ export interface IItem {
   id: string;
   identified: boolean;
   ilvl: number;
+  implicitMods: string[];
   inventoryId: string;
+  itemPrice?: IItemPrice;
   league: string;
   name: string;
   properties: any[];
+  requirements: any[];
+  shaper: boolean;
+  sockets: any[];
   stackSize?: number;
   typeLine: string;
   verified: boolean;