feat: add DataBinding example with interactive controls

Port DataBinding example from old rive-react-native with modal UI for
string, number, and color property controls. Adds @navigation alias
for cross-platform header button support.

Author: mfazekas

example/package.json

@@ -10,6 +10,7 @@
     "build:ios": "react-native build-ios --mode Debug"
   },
   "dependencies": {
+    "@react-native-community/slider": "^5.1.1",
     "@react-native-picker/picker": "^2.11.4",
     "@react-navigation/native": "^7.1.9",
     "@react-navigation/stack": "^7.3.2",

example/src/navigation.ts

@@ -0,0 +1 @@
+export { useNavigation } from '@react-navigation/native';