feat: add notification microservices and transactional outbox

src/modules/notifications/notifications.module.ts

@@ -8,6 +8,7 @@ import { NotificationsService } from './notifications.service';
 import { NotificationsRepository } from './notifications.repository';
 import { Notification, NotificationSchema } from './schemas/notification.schema';
 import { UsersModule } from '../users/users.module';
+import { NotificationServiceClient } from './notification-service.client';
 
 @Module({
   imports: [
@@ -17,7 +18,12 @@ import { UsersModule } from '../users/users.module';
     MongooseModule.forFeature([{ name: Notification.name, schema: NotificationSchema }]),
   ],
   controllers: [NotificationsController],
-  providers: [NotificationsService, NotificationsRepository, NotificationsGateway],
-  exports: [NotificationsService],
+  providers: [
+    NotificationsService,
+    NotificationsRepository,
+    NotificationsGateway,
+    NotificationServiceClient,
+  ],
+  exports: [NotificationsService, NotificationsGateway, NotificationServiceClient],
 })
 export class NotificationsModule {}