Add authentication and idempotency middleware, implement graceful shutdown, and update dependencies

- Introduced `authMiddleware` for request authentication and `optionalAuthMiddleware` for optional authentication.
- Added `idempotencyMiddleware` to ensure idempotent requests are processed correctly, including Redis caching.
- Implemented graceful shutdown for the REST API server to close Redis connections on termination signals.
- Updated `package.json` to include `jsonwebtoken` and its type definitions.

api/services/rest-api/package.json

@@ -16,6 +16,7 @@
     "helmet": "^7.1.0",
     "ethers": "^6.9.0",
     "redis": "^4.6.12",
+    "jsonwebtoken": "^9.0.2",
     "@emoney/validation": "workspace:*",
     "@emoney/blockchain": "workspace:*",
     "@emoney/auth": "workspace:*",
@@ -25,6 +26,7 @@
     "@types/express": "^4.17.21",
     "@types/cors": "^2.8.17",
     "@types/node": "^20.10.0",
+    "@types/jsonwebtoken": "^9.0.5",
     "typescript": "^5.3.0",
     "ts-node-dev": "^2.0.0",
     "jest": "^29.7.0",