feat(medusa, admin-ui, medusa-react, medusa-js): Allow toggling of manage inventory (#3435)

**What**
- Toggle manage inventory in the inventory management modal

**How**
- Create/update/remove inventory item based on if `manage_inventory` is set and if an inventory item already exists
- Move all stock location updates to when the modal is submitted
- Add create-inventory-item endpoint in the core

Fixes CORE-1196

Co-authored-by: Sebastian Rindom <7554214+srindom@users.noreply.github.com>

packages/inventory/src/services/inventory-level.ts

@@ -1,4 +1,4 @@
-import { DeepPartial, EntityManager, FindManyOptions } from "typeorm"
+import { DeepPartial, EntityManager, FindManyOptions, In } from "typeorm"
 import { isDefined, MedusaError } from "medusa-core-utils"
 import {
   buildQuery,
@@ -190,14 +190,34 @@ export default class InventoryLevelService extends TransactionBaseService {
   }
 
   /**
-   * Deletes an inventory level by ID.
-   * @param inventoryLevelId - The ID of the inventory level to delete.
-   */
-  async delete(inventoryLevelId: string): Promise<void> {
+ * Deletes inventory levels by inventory Item ID.
+ * @param inventoryItemId - The ID or IDs of the inventory item to delete inventory levels for.
+ */
+  async deleteByInventoryItemId(inventoryItemId: string | string[]): Promise<void> {
+    const ids = Array.isArray(inventoryItemId) ? inventoryItemId : [inventoryItemId]
     await this.atomicPhase_(async (manager) => {
       const levelRepository = manager.getRepository(InventoryLevel)
 
-      await levelRepository.delete({ id: inventoryLevelId })
+      await levelRepository.delete({ inventory_item_id: In(ids) })
+
+      await this.eventBusService_
+        .withTransaction(manager)
+        .emit(InventoryLevelService.Events.DELETED, {
+          inventory_item_id: inventoryItemId,
+        })
+    })
+  }
+
+  /**
+   * Deletes an inventory level by ID.
+   * @param inventoryLevelId - The ID or IDs of the inventory level to delete.
+   */
+  async delete(inventoryLevelId: string | string[]): Promise<void> {
+    const ids = Array.isArray(inventoryLevelId) ? inventoryLevelId : [inventoryLevelId]
+    await this.atomicPhase_(async (manager) => {
+      const levelRepository = manager.getRepository(InventoryLevel)
+
+      await levelRepository.delete({ id: In(ids) })
 
       await this.eventBusService_
         .withTransaction(manager)

packages/inventory/src/services/inventory.ts

@@ -245,6 +245,10 @@ export default class InventoryService
    * @param inventoryItemId - the id of the inventory item to delete
    */
   async deleteInventoryItem(inventoryItemId: string): Promise<void> {
+    await this.inventoryLevelService_
+      .withTransaction(this.activeManager_)
+      .deleteByInventoryItemId(inventoryItemId)
+
     return await this.inventoryItemService_
       .withTransaction(this.activeManager_)
       .delete(inventoryItemId)