chore: Add user agent to .sdk_metadata.json (#111)

Author: kinyoklion

.sdk_metadata.json

@@ -6,7 +6,8 @@
       "type": "server-side",
       "languages": [
         "Lua"
-      ]
+      ],
+      "wrapperNames": ["lua-server-sdk"]
     }
   }
 }