Switch to using ViewManagerResolver for view managers

Summary:
Right now the FbReactInstanceDelegate provides a list of view managers to the instance during initialization, this means that we're basically eagerly loading all of the view manager classes.

In this change we use ViewManagerResolver instead.

Changelog:
[Android][Changed] - Move ViewManagerResolver into a seperate file

Reviewed By: mdvacca

Differential Revision: D26424214

fbshipit-source-id: 550ade31c256a56d6e32c463f112ea16dd55a218

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewManagerRegistry.java

@@ -19,9 +19,9 @@ import java.util.Map;
 public final class ViewManagerRegistry {
 
   private final Map<String, ViewManager> mViewManagers;
-  private final @Nullable UIManagerModule.ViewManagerResolver mViewManagerResolver;
+  private final @Nullable ViewManagerResolver mViewManagerResolver;
 
-  public ViewManagerRegistry(UIManagerModule.ViewManagerResolver viewManagerResolver) {
+  public ViewManagerRegistry(ViewManagerResolver viewManagerResolver) {
     mViewManagers = MapBuilder.newHashMap();
     mViewManagerResolver = viewManagerResolver;
   }