[fabric] Implement escape/cancel key press callback for TextInput

Summary:
Pressing the escape key down in a TextInput on macOS will be captured on the native side as a cancel event.

This diff adds support for sending the "Escape" key as a key pressed event and wires the delegate method of the backing text input to call the key press event handler with the correct payload.

Test Plan:
- Run Zeratul with Fabric enabled
- Add a key press handler on the textfield logging the received data (e.g. on MDSTextInput)
- Focus the textfield
- Press the escape key
- The key press handler should be called and print that the "Escape" key was pressed.

 https://pxl.cl/3XHR2

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Differential Revision: https://phabricator.intern.facebook.com/D52005857

Tasks: T167538822

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

@@ -586,7 +586,24 @@ - (void)grammarCheckingDidChange:(BOOL)enabled
 
 - (void)submitOnKeyDownIfNeeded:(nonnull NSEvent *)event {}
 
-- (void)textInputDidCancel {}
+- (void)textInputDidCancel
+{
+  if (_eventEmitter) {
+    KeyPressMetrics keyPressMetrics;
+    keyPressMetrics.text = RCTStringFromNSString(@"\x1B"); // Escape key
+    keyPressMetrics.eventCount = _mostRecentEventCount;
+
+    auto const &textInputEventEmitter = *std::static_pointer_cast<TextInputEventEmitter const>(_eventEmitter);
+    auto const &props = *std::static_pointer_cast<TextInputProps const>(_props);
+    if (props.onKeyPressSync) {
+      textInputEventEmitter.onKeyPressSync(keyPressMetrics);
+    } else {
+      textInputEventEmitter.onKeyPress(keyPressMetrics);
+    }
+  }
+
+  [self textInputDidEndEditing];
+}
 
 - (NSDragOperation)textInputDraggingEntered:(nonnull id<NSDraggingInfo>)draggingInfo {
   if ([draggingInfo.draggingPasteboard availableTypeFromArray:self.registeredDraggedTypes]) {