chore: added missing withTransacton, create-variant using TO (#3047)

Create variant integrated with Inventory modules

packages/medusa/src/interfaces/services/inventory.ts

@@ -1,3 +1,4 @@
+import { EntityManager } from "typeorm"
 import { FindConfig } from "../../types/common"
 
 import {
@@ -15,6 +16,8 @@ import {
 } from "../../types/inventory"
 
 export interface IInventoryService {
+  withTransaction(transactionManager?: EntityManager): this
+
   listInventoryItems(
     selector: FilterableInventoryItemProps,
     config?: FindConfig<InventoryItemDTO>

packages/medusa/src/interfaces/services/stock-location.ts

@@ -1,3 +1,4 @@
+import { EntityManager } from "typeorm"
 import { FindConfig } from "../../types/common"
 
 import {
@@ -8,6 +9,7 @@ import {
 } from "../../types/stock-location"
 
 export interface IStockLocationService {
+  withTransaction(transactionManager?: EntityManager): this
   list(
     selector: FilterableStockLocationProps,
     config?: FindConfig<StockLocationDTO>