feat(customer): Introduce customer group (#6137)

**What**
Methods for:
- Bulk create customers
- Bulk and single create of customer groups
- Assigning customer <> group relationships
- listing of customers and customer groups

++ Uses new repository loading mechanism

packages/customer/src/loaders/container.ts

@@ -1,52 +1,9 @@
-import * as defaultRepositories from "@repositories"
+import { MikroOrmBaseRepository, ModulesSdkUtils } from "@medusajs/utils"
+import * as ModuleModels from "@models"
+import * as ModuleServices from "@services"
 
-import { LoaderOptions } from "@medusajs/modules-sdk"
-import { ModulesSdkTypes } from "@medusajs/types"
-import { loadCustomRepositories } from "@medusajs/utils"
-import * as defaultServices from "@services"
-import { asClass } from "awilix"
-
-export default async ({
-  container,
-  options,
-}: LoaderOptions<
-  | ModulesSdkTypes.ModuleServiceInitializeOptions
-  | ModulesSdkTypes.ModuleServiceInitializeCustomDataLayerOptions
->): Promise<void> => {
-  const customRepositories = (
-    options as ModulesSdkTypes.ModuleServiceInitializeCustomDataLayerOptions
-  )?.repositories
-
-  container.register({
-    customerService: asClass(defaultServices.CustomerService).singleton(),
-    addressService: asClass(defaultServices.AddressService).singleton(),
-    customerGroupService: asClass(
-      defaultServices.CustomerGroupService
-    ).singleton(),
-  })
-
-  if (customRepositories) {
-    loadCustomRepositories({
-      defaultRepositories,
-      customRepositories,
-      container,
-    })
-  } else {
-    loadDefaultRepositories({ container })
-  }
-}
-
-function loadDefaultRepositories({ container }) {
-  container.register({
-    baseRepository: asClass(defaultRepositories.BaseRepository).singleton(),
-    customerRepository: asClass(
-      defaultRepositories.CustomerRepository
-    ).singleton(),
-    addressRepository: asClass(
-      defaultRepositories.AddressRepository
-    ).singleton(),
-    customerGroupRepository: asClass(
-      defaultRepositories.CustomerGroupRepository
-    ).singleton(),
-  })
-}
+export default ModulesSdkUtils.moduleContainerLoaderFactory({
+  moduleModels: ModuleModels,
+  moduleServices: ModuleServices,
+  moduleRepositories: { BaseRepository: MikroOrmBaseRepository },
+})