registration error event

Summary:
This is an updated version of #2336 and #7694.

 ---

This adds a `registrationError` event that is emitted by `PushNotificationIOS` whenever an application receives a registration error from APNS (APNS service failure, running on simulator, etc).  This event fires to the exclusion of the `register` event (and vice versa).

**How to use**

Add the following to your `AppDelegate.m`:

```obj-c
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
  [RCTPushNotificationManager didFailToRegisterForRemoteNotificationsWithError:error];
}
```

And register an event handler for the event:

```js
PushNotificationIOS.addEventListener('registrationError', function({ message, code }) {
  // Complete your registration process in error.
});
```

**Test plan**

Added support for this event (and `register`) to UIExplorer as a proof of concept.  Navigating to the push notifications example on a simulator is an easy way to reproduce this e
Closes https://github.com/facebook/react-native/pull/9650

Differential Revision: D3822142

Pulled By: javache

fbshipit-source-id: a15ed8941b74dc3eed2c44c658deccbcaf39ce3d

Examples/UIExplorer/js/PushNotificationIOSExample.js

@@ -50,16 +50,18 @@ class Button extends React.Component {
 
 class NotificationExample extends React.Component {
   componentWillMount() {
-    // Add listener for push notifications
-    PushNotificationIOS.addEventListener('notification', this._onNotification);
-    // Add listener for local notifications
+    PushNotificationIOS.addEventListener('register', this._onRegistered);
+    PushNotificationIOS.addEventListener('registrationError', this._onRegistrationError);
+    PushNotificationIOS.addEventListener('notification', this._onRemoteNotification);
     PushNotificationIOS.addEventListener('localNotification', this._onLocalNotification);
+
+    PushNotificationIOS.requestPermissions();
   }
 
   componentWillUnmount() {
-    // Remove listener for push notifications
-    PushNotificationIOS.removeEventListener('notification', this._onNotification);
-    // Remove listener for local notifications
+    PushNotificationIOS.removeEventListener('register', this._onRegistered);
+    PushNotificationIOS.removeEventListener('registrationError', this._onRegistrationError);
+    PushNotificationIOS.removeEventListener('notification', this._onRemoteNotification);
     PushNotificationIOS.removeEventListener('localNotification', this._onLocalNotification);
   }
 
@@ -101,7 +103,29 @@ class NotificationExample extends React.Component {
     });
   }
 
-  _onNotification(notification) {
+  _onRegistered(deviceToken) {
+    AlertIOS.alert(
+      'Registered For Remote Push',
+      `Device Token: ${deviceToken}`,
+      [{
+        text: 'Dismiss',
+        onPress: null,
+      }]
+    );
+  }
+
+  _onRegistrationError(error) {
+    AlertIOS.alert(
+      'Failed To Register For Remote Push',
+      `Error (${error.code}): ${error.message}`,
+      [{
+        text: 'Dismiss',
+        onPress: null,
+      }]
+    );
+  }
+
+  _onRemoteNotification(notification) {
     AlertIOS.alert(
       'Push Notification Received',
       'Alert message: ' + notification.getMessage(),
@@ -170,8 +194,6 @@ exports.examples = [
 {
   title: 'Badge Number',
   render(): ReactElement<any> {
-    PushNotificationIOS.requestPermissions();
-
     return (
       <View>
         <Button