feat: support accesstoken token statistic (Close #275)

Author: Kerwin

service/package.json

@@ -31,6 +31,7 @@
     "esno": "^0.16.3",
     "express": "^4.18.2",
     "express-rate-limit": "^6.7.0",
+    "gpt-token": "^0.0.5",
     "https-proxy-agent": "^5.0.1",
     "isomorphic-fetch": "^3.0.0",
     "jwt-decode": "^3.1.2",