feat: add session impl (#6254)

packages/backend/server/package.json

@@ -72,6 +72,7 @@
     "keyv": "^4.5.4",
     "lodash-es": "^4.17.21",
     "mixpanel": "^0.18.0",
+    "mustache": "^4.2.0",
     "nanoid": "^5.0.6",
     "nest-commander": "^3.12.5",
     "nestjs-throttler-storage-redis": "^0.4.1",
@@ -87,6 +88,7 @@
     "semver": "^7.6.0",
     "socket.io": "^4.7.4",
     "stripe": "^14.18.0",
+    "tiktoken": "^1.0.13",
     "ts-node": "^10.9.2",
     "typescript": "^5.3.3",
     "ws": "^8.16.0",
@@ -105,6 +107,7 @@
     "@types/keyv": "^4.2.0",
     "@types/lodash-es": "^4.17.12",
     "@types/mixpanel": "^2.14.8",
+    "@types/mustache": "^4",
     "@types/node": "^20.11.20",
     "@types/nodemailer": "^6.4.14",
     "@types/on-headers": "^1.0.3",