[iOS] Remove dropped native handlers (#3819)

## What is happening

While working on #3800 I've noticed frequent crashes on `iOS`. I'll
explain this using the demo from the test code, basically two screens,
second screen has a `RectButton`.

1. Navigate to second screen
2. Go back
3. Navigate to the second screen again
4. App crashes

Sometime it crashes immediately on startup.

## Why is it happening?

`Native` handlers are handled differently compared to others. The main
problem was that we tried to attach handler that was previously dropped,
but `NativeDetector` has no information that this happened. The flow
here looks as follows:

1. We navigate to screen with button
2. `addSubview` is called - at this point it won't attach anything as
`_nativeHandlers` is empty
3. `updateProps` is called - handlers are attached
4. We navigate back to first screen
5. Handler is dropped
6. We navigate again to second screen
7. `addSubview` is called - it tries to attach handler that was dropped,
therefore app crashes

## Solution

To fix this issue, we clear `_nativeHandlers` in `prepareForRecycle`
method.

## Test plan

<details>
<summary>I've tested it on my branch with components re-written to new
API, using the following code in EmptyExample:</summary>

```tsx
import React from 'react';
import { StyleSheet, View } from 'react-native';
import { RectButton } from 'react-native-gesture-handler';

export default function EmptyExample() {
  return (
    <View style={styles.container}>
      <RectButton
        style={styles.button}
        onPress={() => console.log('Hello World!')}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  button: {
    width: 100,
    height: 30,
    borderRadius: 10,
    backgroundColor: 'pink',
  },
});
```

</details>

Author: m-bert

packages/react-native-gesture-handler/apple/RNGestureHandlerDetector.mm

@@ -33,11 +33,7 @@ + (BOOL)shouldBeRecycled
 - (instancetype)initWithFrame:(CGRect)frame
 {
   if (self = [super initWithFrame:frame]) {
-    static const auto defaultProps = std::make_shared<const RNGestureHandlerDetectorProps>();
-    _props = defaultProps;
-    _moduleId = -1;
-    _nativeHandlers = [NSMutableSet set];
-    _attachedHandlers = [NSMutableSet set];
+    [self setDefaultProps];
   }
 
   return self;
@@ -72,6 +68,15 @@ - (void)willMoveToWindow:(RNGHWindow *)newWindow
   }
 }
 
+- (void)setDefaultProps
+{
+  static const auto defaultProps = std::make_shared<const RNGestureHandlerDetectorProps>();
+  _props = defaultProps;
+  _moduleId = -1;
+  _nativeHandlers = [NSMutableSet set];
+  _attachedHandlers = [NSMutableSet set];
+}
+
 - (void)dispatchStateChangeEvent:(RNGestureHandlerDetectorEventEmitter::OnGestureHandlerStateChange)event
 {
   if (_eventEmitter != nullptr) {
@@ -127,6 +132,13 @@ - (BOOL)shouldAttachGestureToSubview:(NSNumber *)handlerTag
   return [[[handlerManager registry] handlerWithTag:handlerTag] wantsToAttachDirectlyToView];
 }
 
+- (void)prepareForRecycle
+{
+  [super prepareForRecycle];
+
+  [self setDefaultProps];
+}
+
 - (void)didAddSubview:(RNGHUIView *)view
 {
   [super didAddSubview:view];