Add method field to persistedStateReducer

Summary:
When sending a message from the mobile side, you call something like:

`send(method: string, params: Object)`

But when receiving it in the reducer, you only get the params. Adding method so you can distinguish them.

Reviewed By: passy

Differential Revision: D10447890

fbshipit-source-id: f1fe925e82355866f86b322ecd3c72c604ae86af

src/plugins/network/index.js

@@ -121,6 +121,7 @@ export default class extends FlipperPlugin<State, *, PersistedState> {
 
   static persistedStateReducer = (
     persistedState: PersistedState,
+    method: string,
     data: Request | Response,
   ): PersistedState => {
     const dataType: 'requests' | 'responses' = data.url