Feat/decline order edit (#2234)

**What**
- Decline an order edit from a store endpoint
- Refactor totals setting to a service method

Fixes CORE-502

packages/medusa-js/src/resources/order-edits.ts

@@ -1,4 +1,4 @@
-import { StoreOrderEditsRes } from "@medusajs/medusa"
+import { StoreOrderEditsRes, StorePostOrderEditsOrderEditDecline } from "@medusajs/medusa"
 import { ResponsePromise } from "../typings"
 import BaseResource from "./base"
 
@@ -10,6 +10,15 @@ class OrderEditsResource extends BaseResource {
     const path = `/store/order-edits/${id}`
     return this.client.request("GET", path, undefined, {}, customHeaders)
   }
+
+  decline(
+    id: string, 
+    payload: StorePostOrderEditsOrderEditDecline,
+    customHeaders: Record<string, any> = {}
+  ) {
+    const path = `/store/order-edits/${id}/decline`
+    return this.client.request("POST", path, payload, {}, customHeaders)
+  }
 }
 
 export default OrderEditsResource