feat: add macos support

packages/stack/src/views/GestureHandler.macos.tsx

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+export {
+  PanGestureHandler,
+  GestureHandlerRootView,
+  GestureState,
+} from './CompatGestureHandler';
+export type { PanGestureHandlerGestureEvent } from 'react-native-gesture-handler';

packages/stack/src/views/MaskedView.macos.tsx

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+import StubbedMaskedView from './MaskedView';
+
+export default StubbedMaskedView;

packages/stack/src/views/TouchableItem.macos.tsx

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+import { TouchableOpacity } from 'react-native';
+
+export const TouchableItem = (TouchableOpacity as any) as typeof import('./TouchableItem.native').TouchableItem;