Fix keyboard height in useAnimatedKeyboard on language change on iOS (s…

…oftware-mansion#3940)

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## Summary

Fixes a bug when changing keyboard language on iOS:

Bug:

https://user-images.githubusercontent.com/6280457/212095624-4df7e0b0-d3e6-4bdd-8378-ad8c077e6fb2.mp4

Fixed bug:


https://user-images.githubusercontent.com/6280457/212096575-aa36cb88-fee5-4f4c-bd37-676973834d48.mp4

Fixes
software-mansion#3721

`useAnimatedKeyboard` reported invalid keyboard height in that case,
because we invalided display link too early, in `stopAnimation` and we
reported the height before suggestions bar appeared. In the next frame
the suggestion bar appears and we can calculate correct keyboard height.

## Test plan

Run AnimatedKeyboardExample, bring up the keyboard and change keyboard
language. The text input should be above the keyboard in correct
position.

<details>
<summary>Example for switching between numeric/regular
keyboard:</summary>


```js
import React from 'react';

import { TextInput, View, StyleSheet } from 'react-native';

import { useAnimatedKeyboard, useAnimatedStyle } from 'react-native-reanimated';

export default function App() {
  const { height } = useAnimatedKeyboard();

  useAnimatedStyle(() => {
    console.log('HEIGHT', height.value);
    return {};
  });

  return (
    <View style={styles.container}>
      <TextInput style={styles.input} keyboardType="default" />
      <TextInput style={styles.input} keyboardType="number-pad" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    padding: 20,
  },
  input: {
    borderBottomWidth: 1,
    borderBottomColor: '#ccc',
    marginBottom: 20,
    backgroundColor: '#ddd',
    height: 50,
  },
});
```
</details>

ios/keyboardObserver/REAKeyboardEventObserver.m

@@ -18,6 +18,7 @@ @implementation REAKeyboardEventObserver {
   int _windowsCount;
   UIView *_keyboardView;
   KeyboardState _state;
+  bool _shouldInvalidateDisplayLink;
 }
 
 - (instancetype)init
@@ -26,6 +27,7 @@ - (instancetype)init
   _listeners = [[NSMutableDictionary alloc] init];
   _nextListenerId = @0;
   _state = UNKNOWN;
+  _shouldInvalidateDisplayLink = false;
   return self;
 }
 
@@ -85,9 +87,11 @@ - (void)runAnimation
 
 - (void)stopAnimation
 {
-  [displayLink invalidate];
-  displayLink = nil;
   [self updateKeyboardFrame];
+  // there might be a case that keyboard will change height in the next frame
+  // (for example changing keyboard language so that suggestions appear)
+  // so we invalidate display link after we handle that in the next frame
+  _shouldInvalidateDisplayLink = true;
 }
 
 - (void)updateKeyboardFrame
@@ -101,6 +105,12 @@ - (void)updateKeyboardFrame
   for (NSString *key in _listeners.allKeys) {
     ((KeyboardEventListenerBlock)_listeners[key])(_state, keyboardHeight);
   }
+
+  if (_shouldInvalidateDisplayLink) {
+    _shouldInvalidateDisplayLink = false;
+    [displayLink invalidate];
+    displayLink = nil;
+  }
 }
 
 - (CGFloat)computeKeyboardHeight:(UIView *)keyboardView