refactor scrollable ref & native gestures using useAnimatedRef and Re…

…animated.ScrollView + createNativeWrapper

remove preserveScrollMomentum + scrollBuffer + lockableScrollableContentOffsetY props

we're using `preserveScrollMomentum` in the media picker, but i'm removing it because i feel the behavior is actually detrimental to the UX, and to simplify the refactor to scrollEnabled in the next commit.

`lockableScrollableContentOffsetY` is removed since it won't be necessary after the scrollEnabled refactor

`scrollBuffer` was no longer used.

removed custom gesture/scroll handling hooks

after refactoring to use scrollEnabled, we can add other props to add custom behaviors if needed.

refactored scroll/pan gesture interaction using animated scrollEnabled prop based on software-mansion/react-native-gesture-handler#420 (comment)

example/app/src/screens/index.ts

@@ -112,13 +112,6 @@ export const screens = [
         slug: 'Advanced/PullToRefreshExample',
         getScreen: () => require('./advanced/PullToRefreshExample').default,
       },
-      {
-        name: 'Custom Gesture Handling',
-        slug: 'Advanced/CustomGestureHandling',
-        getScreen: () =>
-          require('./advanced/customGestureHandling/CustomGestureHandling')
-            .default,
-      },
     ] as ShowcaseExampleScreenType[],
   },
 ];