Move server add-on interfaces to flipper-common

Reviewed By: antonk52

Differential Revision: D34169419

fbshipit-source-id: 69fcc8da7d98f59818fbb5b486a488f19830cd81

desktop/flipper-plugin/src/__tests__/api.node.tsx

@@ -109,6 +109,7 @@ test('Correct top level API exposed', () => {
       "FileDescriptor",
       "FileEncoding",
       "FlipperLib",
+      "FlipperServerForServerAddOn",
       "HighlightManager",
       "Idler",
       "InteractionReport",
@@ -119,6 +120,8 @@ test('Correct top level API exposed', () => {
       "Notification",
       "PluginClient",
       "RemoteServerContext",
+      "ServerAddOn",
+      "ServerAddOnPluginConnection",
     ]
   `);
 });

desktop/flipper-plugin/src/index.tsx

@@ -152,4 +152,7 @@ export {
   DeviceLogLevel,
   Logger,
   CrashLog,
+  ServerAddOn,
+  ServerAddOnPluginConnection,
+  FlipperServerForServerAddOn,
 } from 'flipper-common';