Add link to Flipper GraphQL plugin

Summary:
This just adds a link next to each request in the Flipper GraphQL plugin to take you to the mobile GraphQL efficiency tool. We want this to be a kind of hub for mobile devs using GraphQL, alongside GraphiQL.

This was a suggestion from a product dev who attended our demo. Later we could also pull down actually efficiency info and show it directly in Flipper.

Reviewed By: ginfung

Differential Revision: D47029548

fbshipit-source-id: 05185e57bfbfaab9169a6b154822ede82d50fd4d

desktop/static/icons.json

@@ -670,5 +670,8 @@
   ],
   "settings-internal": [
     16
+  ],
+  "weather-thunder-outline": [
+    16
   ]
-}
+}