Sync model names and costs via LiteLLM's registry (#227)

Our friends at https://github.com/BerriAI/litellm maintain a great
registry of model costs which we can reuse. This script helps us
automatically keep things in sync.

To facilitate this, I moved the models into their own file. Note that
this change _does not_ include the application of any changes from this
script. That's in [a separate
PR](#228) so we
can clearly see what they are.

Author: ankrgyl

packages/proxy/package.json

@@ -70,13 +70,15 @@
     "@types/jsonwebtoken": "^9.0.7",
     "@types/node": "^20.10.5",
     "@types/uuid": "^9.0.7",
+    "@types/yargs": "^17.0.33",
     "@typescript-eslint/eslint-plugin": "^8.21.0",
     "esbuild": "^0.19.10",
     "npm-run-all": "^4.1.5",
     "tsup": "^8.4.0",
     "typescript": "5.5.4",
     "vite-tsconfig-paths": "^4.3.2",
-    "vitest": "^2.1.9"
+    "vitest": "^2.1.9",
+    "yargs": "^17.7.2"
   },
   "dependencies": {
     "@anthropic-ai/sdk": "^0.39.0",