Use .ts files for vite config for type safety

tsconfig.json

@@ -18,6 +18,7 @@
     // Workaround for https://github.com/microsoft/TypeScript/issues/55132
     "useDefineForClassFields": false,
     "allowImportingTsExtensions": true,
+    "skipLibCheck": true,
     "paths": {
       // These imports within @livekit/components-core and
       // @livekit/components-react are broken under the "bundler" module
@@ -50,6 +51,7 @@
   "include": [
     "./node_modules/matrix-js-sdk/src/@types/*.d.ts",
     "./src/**/*.ts",
-    "./src/**/*.tsx"
+    "./src/**/*.tsx",
+    "*.ts"
   ]
 }