Emit move PointerEvents for hover

Summary:
Changelog: [iOS][Internal] - Emit move PointerEvents when hovering with an indirect pointer

This diff ensures that when a user is hovering an RN app w/ an indirect pointer (mouse/trackpad/ect.) that `pointermove` events are emitted. Previously `pointermove` was only fired on touch interactions on iOS.

Reviewed By: lunaleaps

Differential Revision: D37353158

fbshipit-source-id: 30366324ea10c91a38dbbc1be1032c021fd8a0e0

React/Fabric/RCTSurfaceTouchHandler.mm

@@ -651,6 +651,8 @@ RCT_NOT_IMPLEMENTED(-(instancetype)initWithTarget : (id)target action : (SEL)act
 
   NSTimeInterval timestamp = CACurrentMediaTime();
 
+  BOOL hasMoveListenerInEventPath = NO;
+
   // Over
   if (prevTargetView != targetView) {
     BOOL shouldEmitOverEvent = IsAnyViewInPathListeningToEvent(eventPathViews, ViewEvents::Offset::PointerOver);
@@ -686,6 +688,19 @@ RCT_NOT_IMPLEMENTED(-(instancetype)initWithTarget : (id)target action : (SEL)act
     if (shouldEmitEvent && !hasParentEnterListener) {
       hasParentEnterListener = YES;
     }
+
+    if (!hasMoveListenerInEventPath && IsViewListeningToEvent(componentView, ViewEvents::Offset::PointerMove2)) {
+      hasMoveListenerInEventPath = YES;
+    }
+  }
+
+  // Moving
+  if (hasMoveListenerInEventPath) {
+    SharedTouchEventEmitter eventEmitter = GetTouchEmitterFromView(targetView, [recognizer locationInView:targetView]);
+    if (eventEmitter != nil) {
+      PointerEvent event = CreatePointerEventFromIncompleteHoverData(targetView, clientLocation, timestamp);
+      eventEmitter->onPointerMove2(event);
+    }
   }
 
   // Out