feat: Add the basic implementation of notification module (#7282)

* feat: Add the basic implementation of notification module

* fix: Minor fixes and introduction of idempotency key

* fix: Changes based on PR review

packages/modules/notification/src/module-definition.ts

@@ -0,0 +1,44 @@
+import { ModuleExports } from "@medusajs/types"
+import * as ModuleServices from "@services"
+import { NotificationModuleService } from "@services"
+import { Modules } from "@medusajs/modules-sdk"
+import * as ModuleModels from "@models"
+import { ModulesSdkUtils } from "@medusajs/utils"
+import * as ModuleRepositories from "@repositories"
+import loadProviders from "./loaders/providers"
+
+const migrationScriptOptions = {
+  moduleName: Modules.NOTIFICATION,
+  models: ModuleModels,
+  pathToMigrations: __dirname + "/migrations",
+}
+
+const runMigrations = ModulesSdkUtils.buildMigrationScript(
+  migrationScriptOptions
+)
+
+const revertMigration = ModulesSdkUtils.buildRevertMigrationScript(
+  migrationScriptOptions
+)
+
+const containerLoader = ModulesSdkUtils.moduleContainerLoaderFactory({
+  moduleModels: ModuleModels,
+  moduleRepositories: ModuleRepositories,
+  moduleServices: ModuleServices,
+})
+
+const connectionLoader = ModulesSdkUtils.mikroOrmConnectionLoaderFactory({
+  moduleName: Modules.NOTIFICATION,
+  moduleModels: Object.values(ModuleModels),
+  migrationsPath: __dirname + "/migrations",
+})
+
+const service = NotificationModuleService
+const loaders = [containerLoader, connectionLoader, loadProviders]
+
+export const moduleDefinition: ModuleExports = {
+  service,
+  loaders,
+  revertMigration,
+  runMigrations,
+}