chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

packages/modules/inventory-next/src/services/__tests__/noop.ts

@@ -0,0 +1,5 @@
+describe("noop", function () {
+  it("should run", function () {
+    expect(true).toBe(true)
+  })
+})

packages/modules/inventory-next/src/services/index.ts

@@ -0,0 +1,2 @@
+export { default as InventoryModuleService } from "./inventory"
+export { default as InventoryLevelService } from "./inventory-level"

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

@@ -0,0 +1,79 @@
+import {
+  Context,
+  CreateInventoryLevelInput,
+  DAL,
+  SharedContext,
+} from "@medusajs/types"
+import {
+  InjectTransactionManager,
+  MedusaContext,
+  ModulesSdkUtils,
+} from "@medusajs/utils"
+
+import { InventoryLevel } from "../models/inventory-level"
+import { InventoryLevelRepository } from "@repositories"
+
+type InjectedDependencies = {
+  inventoryLevelRepository: InventoryLevelRepository
+}
+
+export default class InventoryLevelService<
+  TEntity extends InventoryLevel = InventoryLevel
+> extends ModulesSdkUtils.internalModuleServiceFactory<InjectedDependencies>(
+  InventoryLevel
+)<TEntity> {
+  protected readonly inventoryLevelRepository: InventoryLevelRepository
+
+  constructor(container: InjectedDependencies) {
+    super(container)
+    this.inventoryLevelRepository = container.inventoryLevelRepository
+  }
+
+  async retrieveStockedQuantity(
+    inventoryItemId: string,
+    locationIds: string[] | string,
+    context: Context = {}
+  ): Promise<number> {
+    const locationIdArray = Array.isArray(locationIds)
+      ? locationIds
+      : [locationIds]
+
+    return await this.inventoryLevelRepository.getStockedQuantity(
+      inventoryItemId,
+      locationIdArray,
+      context
+    )
+  }
+
+  async getAvailableQuantity(
+    inventoryItemId: string,
+    locationIds: string[] | string,
+    context: Context = {}
+  ): Promise<number> {
+    const locationIdArray = Array.isArray(locationIds)
+      ? locationIds
+      : [locationIds]
+
+    return await this.inventoryLevelRepository.getAvailableQuantity(
+      inventoryItemId,
+      locationIdArray,
+      context
+    )
+  }
+
+  async getReservedQuantity(
+    inventoryItemId: string,
+    locationIds: string[] | string,
+    context: Context = {}
+  ) {
+    if (!Array.isArray(locationIds)) {
+      locationIds = [locationIds]
+    }
+
+    return await this.inventoryLevelRepository.getReservedQuantity(
+      inventoryItemId,
+      locationIds,
+      context
+    )
+  }
+}