Enable Carrier selection from Flipper (Dogfooding)

Summary: Add a dogfooding tab in the Zero Rating devtools in flipper. The tab shows a list of all carriers and carrier ID (will later allow to start  dogfooding after choosing one)

Reviewed By: zaxy78

Differential Revision: D24675379

fbshipit-source-id: 044b6d957976a05bfe2666ca0510531102f9d0f6

desktop/static/icons.json

@@ -559,5 +559,8 @@
   ],
   "sample-hi": [
     20
+  ],
+  "dog": [
+    16
   ]
-}
+}