feat: add notification microservices and transactional outbox

apps/api-gateway/src/main.ts

@@ -0,0 +1,3 @@
+import { bootstrap } from '../../../src/main';
+
+void bootstrap();

apps/api-gateway/tsconfig.app.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "declaration": false,
+    "outDir": "../../dist/apps/api-gateway"
+  },
+  "include": ["src/**/*.ts", "../../src/**/*.ts", "../../libs/**/*.ts"],
+  "exclude": ["node_modules", "dist", "test", "**/*.spec.ts"]
+}