[Web LA] Custom `Keyframe` animations

[m-bert]

Summary

This PR adds support for custom layout animations created via Keyframe on web.

[!IMPORTANT] This PR replaces #5277

Test plan

Tested on example app and the following code snippet:

Test code

```jsx import { StyleSheet, View, Text, Pressable } from 'react-native'; import React, { useState } from 'react'; import Animated, { Easing, Keyframe } from 'react-native-reanimated'; const entering = new Keyframe({ 0: { transform: [ { translateX: -500 }, { translateY: -300 }, { scale: 1.25 }, { skewY: '25deg' }, ], opacity: 0.3, easing: Easing.cubic, }, 70: { transform: [{ translateX: 250 }, { translateY: 100 }, { scale: 1.25 }], opacity: 0.7, }, }); const exiting = new Keyframe({ 0: { easing: Easing.exp, }, 100: { transform: [ { translateX: 700 }, { translateY: 250 }, { scale: 0.3 }, { rotate: '225deg' }, ], opacity: 0, }, }); export default function EmptyExample() { const [show, setShow] = useState(true); return ( {show && ( )} setShow((prev) => !prev)} style={styles.button}> Click me! ); } const styles = StyleSheet.create({ container: { flex: 1, alignItems: 'center', justifyContent: 'center', }, box: { width: 250, height: 250, backgroundColor: '#782aeb', }, button: { width: 100, height: 50, backgroundColor: '#57b495', display: 'flex', alignItems: 'center', justifyContent: 'space-around', borderRadius: 15, position: 'absolute', top: 10, left: 10, }, }); ```