[BUG] Viewport listeners not provided IntersectionObserverEntry

[kalley]

1. Read the FAQs 👇

2. Describe the bug

The docs state that the IntersectionObserverEntry is provided to both onViewportEnter and onViewportLeave, but that is not actually the case as can be seen here:

motion/src/motion/features/viewport/use-viewport.ts

Lines 86 to 89 in ac68f26

	const callback = isIntersecting
	? props.onViewportEnter
	: props.onViewportLeave
	callback?.()

3. IMPORTANT: Provide a CodeSandbox reproduction of the bug

A CodeSandbox minimal reproduction will allow us to quickly follow the reproduction steps. Without one, this bug report won't be accepted.

https://codesandbox.io/s/blissful-dirac-lyu9b?file=/src/App.js

You can see that undefined is logged to the console

4. Steps to reproduce

Steps to reproduce the behavior:

1. Go to the codesandbox
2. Open the console
3. See { entry: undefined }.

5. Expected behavior

That entry should be an instance of IntersectionObserverEntry as stated in the docs