[fabric] Add keyboard event handling to TextInput component

Summary: This diff adds keyboard event handling to the TextInput component by testing the valid keys for manual keyboard event handling and dispatching key events to the View component keyboard handling method.

Test Plan:
- Run Workplace Chat with Fabric enabled.
- Open a message thread with 3 or more participants.
- Type `@` to display the reference selector.
- Change the selection with the up and down arrows and select an entry with tab to test the custom keyboard event handling.

 https://pxl.cl/4ghtH

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Differential Revision: https://phabricator.intern.facebook.com/D53241729

Tasks: T157889406, T154618477

Author: Nick Lefever

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

@@ -563,10 +563,6 @@ - (void)grammarCheckingDidChange:(BOOL)enabled
   }
 }
 
-- (BOOL)hasValidKeyDownOrValidKeyUp:(nonnull NSString *)key {
-  return YES;
-}
-
 - (void)submitOnKeyDownIfNeeded:(nonnull NSEvent *)event {}
 
 - (void)textInputDidCancel {}
@@ -602,7 +598,7 @@ - (BOOL)textInputShouldHandleDeleteForward:(nonnull id<RCTBackedTextInputViewPro
 }
 
 - (BOOL)textInputShouldHandleKeyEvent:(nonnull NSEvent *)event {
-  return YES;
+  return ![self handleKeyboardEvent:event];
 }
 
 - (BOOL)textInputShouldHandlePaste:(nonnull id<RCTBackedTextInputViewProtocol>)sender {

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.h

@@ -79,6 +79,11 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)finalizeUpdates:(RNComponentViewUpdateMask)updateMask NS_REQUIRES_SUPER;
 - (void)prepareForRecycle NS_REQUIRES_SUPER;
 
+#if TARGET_OS_OSX // [macOS
+- (BOOL)handleKeyboardEvent:(NSEvent *)event;
+- (void)buildDataTransferItems:(std::vector<facebook::react::DataTransferItem> &)dataTransferItems forPasteboard:(NSPasteboard *)pasteboard;
+#endif // macOS]
+
 /*
  * This is a fragment of temporary workaround that we need only temporary and will get rid of soon.
  */