Rename addRootView to startSurface

Summary: I'm only renaming the new `addRootView` that I added (which takes the moduleName, and uses startSurfaceWithConstraints), since the other one implements the UIManager interface method that's shared with paper.

Reviewed By: shergin

Differential Revision: D16432425

fbshipit-source-id: 392af42690052551504676df776bac6d1a968785

ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -138,11 +138,12 @@ public FabricUIManager(
     mReactApplicationContext.addLifecycleEventListener(this);
   }
 
+  // TODO (T47819352): Rename this to startSurface for consistency with xplat/iOS
   @Override
   public <T extends View> int addRootView(
       final T rootView, final WritableMap initialProps, final @Nullable String initialUITemplate) {
     final int rootTag = ReactRootViewTagGenerator.getNextRootViewTag();
-    // TODO T31905686: Refactor both addRootView methods into one method
+    // TODO T31905686: Combine with startSurface below
     ThemedReactContext reactContext =
         new ThemedReactContext(mReactApplicationContext, rootView.getContext());
     mMountingManager.addRootView(rootTag, rootView);
@@ -158,7 +159,7 @@ public <T extends View> int addRootView(
     return rootTag;
   }
 
-  public <T extends View> int addRootView(
+  public <T extends View> int startSurface(
       final T rootView,
       final String moduleName,
       final WritableMap initialProps,