Fix broken Loading/Refreshing indicator on Android

Summary:
The Loading.../Refreshing... indicator is currently broken on Android.
The reason is related to D42599220
We used to have a Toast shown to users on Android as a fallback, but as the
DevLoadingView is not always loaded as a module in the core package, this ends up in the banner never beign shown to the user (on RN Tester or template apps).

Changelog:
[Android] [Fixed] - Fix broken Loading/Refreshing indicator on Android

Reviewed By: cipolleschi

Differential Revision: D49876757

fbshipit-source-id: 400e002327ebca908e3e7a7f81c5066888ac4e9b

Author: cortinico

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/shell/MainReactPackage.java

@@ -25,6 +25,7 @@
 import com.facebook.react.modules.blob.FileReaderModule;
 import com.facebook.react.modules.camera.ImageStoreManager;
 import com.facebook.react.modules.clipboard.ClipboardModule;
+import com.facebook.react.modules.devloading.DevLoadingModule;
 import com.facebook.react.modules.devtoolssettings.DevToolsSettingsManagerModule;
 import com.facebook.react.modules.dialog.DialogModule;
 import com.facebook.react.modules.fresco.FrescoModule;
@@ -72,6 +73,7 @@
       AppearanceModule.class,
       AppStateModule.class,
       BlobModule.class,
+      DevLoadingModule.class,
       FileReaderModule.class,
       ClipboardModule.class,
       DialogModule.class,
@@ -113,6 +115,8 @@ public MainReactPackage(MainPackageConfig config) {
         return new AppStateModule(context);
       case BlobModule.NAME:
         return new BlobModule(context);
+      case DevLoadingModule.NAME:
+        return new DevLoadingModule(context);
       case FileReaderModule.NAME:
         return new FileReaderModule(context);
       case ClipboardModule.NAME:
@@ -371,6 +375,7 @@ public ReactModuleInfoProvider getReactModuleInfoProvider() {
             AppearanceModule.class,
             AppStateModule.class,
             BlobModule.class,
+            DevLoadingModule.class,
             FileReaderModule.class,
             ClipboardModule.class,
             DialogModule.class,