feat(medusa): Implement premises of the creation flow of an order edit (#2187)

**What**
- Implements the admin create end point 
- Service implementation of the create method and the retrieveActive as well as the totals computation
- Improve compute line items
- client
  - medusa-js api
  - medusa-react mutations hooks

**Tests**
- Unit tests of the create end points
- Unit tests of the service create method
- Integration tests for admin that also take into account totals computations
- client
  - medusa-js tests
  - medusa-react hooks tests

FIXES CORE-491

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

@@ -1,6 +1,7 @@
 import {
-  AdminOrdersEditsRes,
-  AdminOrderEditDeleteRes
+  AdminOrderEditDeleteRes,
+  AdminOrderEditsRes,
+  AdminPostOrderEditsReq,
 } from "@medusajs/medusa"
 import { ResponsePromise } from "../../typings"
 import BaseResource from "../base"
@@ -9,11 +10,19 @@ class AdminOrderEditsResource extends BaseResource {
   retrieve(
     id: string,
     customHeaders: Record<string, any> = {}
-  ): ResponsePromise<AdminOrdersEditsRes> {
+  ): ResponsePromise<AdminOrderEditsRes> {
     const path = `/admin/order-edits/${id}`
     return this.client.request("GET", path, undefined, {}, customHeaders)
   }
 
+  create(
+    payload: AdminPostOrderEditsReq,
+    customHeaders: Record<string, any> = {}
+  ): ResponsePromise<AdminOrderEditsRes> {
+    const path = `/admin/order-edits`
+    return this.client.request("POST", path, payload, {}, customHeaders)
+  }
+
   delete(
     id: string,
     customHeaders: Record<string, any> = {}