Refactor CrashReporter plugin

Summary: This diff refactors CrashReporter Plugin. The business logic of crash reporter plugin was placed in the `iOSDevice.js` as it gets the hook to the initialisation of iOSDevice. This diff moves the business logic to the Crash Reporter plugin files under the plugins folder. To get the hook, so that we can add our watcher, I have added a static function over `FlipperBasePlugin`, which if exists, will be called once `REGISTER_PLUGIN` event is dispatched

Reviewed By: danielbuechele

Differential Revision: D13529035

fbshipit-source-id: 28216b273b4032727859107d8a6751c6465af9ac

src/plugin.js

@@ -9,6 +9,7 @@ import type {KeyboardActions} from './MenuBar.js';
 import type {App} from './App.js';
 import type Logger from './fb-stubs/Logger.js';
 import type Client from './Client.js';
+import type {Store} from './reducers/index.js';
 
 import React from 'react';
 import type {Node} from 'react';
@@ -69,6 +70,13 @@ export class FlipperBasePlugin<
   static getActiveNotifications: ?(
     persistedState: PersistedState,
   ) => Array<Notification>;
+  static onRegisterPlugin: ?(
+    store: Store,
+    setPersistedState: (
+      pluginKey: string,
+      newPluginState: ?PersistedState,
+    ) => void,
+  ) => void;
   // forbid instance properties that should be static
   title: empty;
   id: empty;