[fabric] Add drag and drop support to TextInput component

Summary: Add support for drag and drop to the TextInput component. This re-uses the drag and drop handlers implemented on the View component to support dropping images/files on TextInput views directly.

Test Plan:
* Run Zeratul with Fabric enabled
* Drag and drop an image on the message composer
* Send the attachment

https://pxl.cl/4ldBX

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Differential Revision: https://phabricator.intern.facebook.com/D53674740

Author: Nick Lefever

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -572,22 +572,32 @@ - (void)submitOnKeyDownIfNeeded:(nonnull NSEvent *)event {}
 - (void)textInputDidCancel {}
 
 - (NSDragOperation)textInputDraggingEntered:(nonnull id<NSDraggingInfo>)draggingInfo {
+  if ([draggingInfo.draggingPasteboard availableTypeFromArray:self.registeredDraggedTypes]) {
+    return [self draggingEntered:draggingInfo];
+  }
   return NSDragOperationNone;
 }
 
 - (void)textInputDraggingExited:(nonnull id<NSDraggingInfo>)draggingInfo {
-  return;
+  if ([draggingInfo.draggingPasteboard availableTypeFromArray:self.registeredDraggedTypes]) {
+    [self draggingExited:draggingInfo];
+  }
 }
 
-- (BOOL)textInputShouldHandleDeleteBackward:(nonnull id<RCTBackedTextInputViewProtocol>)sender {
+- (BOOL)textInputShouldHandleDragOperation:(nonnull id<NSDraggingInfo>)draggingInfo {
+  if ([draggingInfo.draggingPasteboard availableTypeFromArray:self.registeredDraggedTypes]) {
+    [self performDragOperation:draggingInfo];
+    return NO;
+  }
+
   return YES;
 }
 
-- (BOOL)textInputShouldHandleDeleteForward:(nonnull id<RCTBackedTextInputViewProtocol>)sender {
+- (BOOL)textInputShouldHandleDeleteBackward:(nonnull id<RCTBackedTextInputViewProtocol>)sender {
   return YES;
 }
 
-- (BOOL)textInputShouldHandleDragOperation:(nonnull id<NSDraggingInfo>)draggingInfo {
+- (BOOL)textInputShouldHandleDeleteForward:(nonnull id<RCTBackedTextInputViewProtocol>)sender {
   return YES;
 }