Add error about functional components being used with old API

[m-bert]

Description

Old API does not support functional components as it requires assigning ref to handler's child. If someone tries to pass functional component into handler, behavior differs based on platform:

• Android - app will crash with the following error message:

• Web - app will crash in GestureHandlerDelegate:

  • Cannot read properties of undefined (reading 'isButtonInConfig')

• iOS - app won't crash, but the handler doesn't work anyway

This PR adds error that will be thrown when handler cannot obtain target view. This will unify behavior across platforms, as well as provide explanation of what went wrong.

Test plan

Tested on the following code:

import React from 'react';
import { View } from 'react-native';
import { TapGestureHandler } from 'react-native-gesture-handler';

const MyView = () => {
  return <View />;
};

export default function RectButtonBorders() {
  return (
    <TapGestureHandler onHandlerStateChange={() => console.log('click')}>
      <MyView />
    </TapGestureHandler>
  );
}