Remove `Unflip`

[Su-Yong]

Summary

An Unflip component stops propagation of animation from parent Flip. Then, why don't merge this function to Flip?

Description

• Remove Unflip
• add propagation property in Flip
  • add propagationProperties property in Flip

interface FlipProps {
  // ...
  propagation?: 'only' | 'children';
  propagationProperties?: 'inherit' | string[];
}

<Flip propagation={'only'}> // works like Wrapped unflip in children
	<div>
		asdf
	</div>
</Flip>

<Flip propagation={'children'} propagationProperties={'inherit'}> // default
	<div>
		asdf
	</div>
</Flip>