feat: notifications (#1947)

* feat: notifications
* feat: watchers

* improvements

* handle page move for watchers

* make watchers non-blocking

* more

apps/server/src/core/notification/notification.module.ts

@@ -0,0 +1,20 @@
+import { Module } from '@nestjs/common';
+import { NotificationService } from './notification.service';
+import { NotificationController } from './notification.controller';
+import { NotificationProcessor } from './notification.processor';
+import { CommentNotificationService } from './services/comment.notification';
+import { PageNotificationService } from './services/page.notification';
+import { WsModule } from '../../ws/ws.module';
+
+@Module({
+  imports: [WsModule],
+  controllers: [NotificationController],
+  providers: [
+    NotificationService,
+    NotificationProcessor,
+    CommentNotificationService,
+    PageNotificationService,
+  ],
+  exports: [NotificationService],
+})
+export class NotificationModule {}