fetch item prices - throttle end points with promise queue

app/model/index.ts

@@ -1 +1,6 @@
+export * from './frame-type';
+export * from './item';
+export * from './item-price';
 export * from './league';
+export * from './rarity-color';
+export * from './stash-tab';

app/model/item-price.ts

@@ -0,0 +1,14 @@
+export interface IItemPrice {
+  currency_rec: string;
+  data: any;
+  error: number;
+  item_base: string;
+  max_price: string;
+  median_price: string;
+  min_price: string;
+  name: string;
+  pred_explanation: any[];
+  recommendedPrice: string;
+  resultsCounted: number;
+  status: number;
+}

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;