Add Example of a SwipeRecognizer

[sebmarkbage]

Stacked on #32412.

To effectively useSwipeTransition you need something to start and stop the gesture as well as triggering an Action.

This adds an example Gesture Recognizer to the fixture. Instead of having this built-in to React itself, instead the idea is to leave this to various user space Component libraries. It can be done in different ways for different use cases. It could use JS driven or native ScrollTimeline or both.

This example uses a native scroll with scroll snapping to two edges. If you swipe far enough to snap to the other edge, it triggers an Action at the end.

This particular example uses a position: sticky to wrap the content of the Gesture Recognizer. This means that it's inert by itself. It doesn't scroll its content just like a plain JS recognizer using pointer events would. This is useful because it means that scrolling doesn't affect content before we start (the "scroll" event fires after scrolling has already started) so we don't have to both trying to start it earlier. It also means that scrolling doesn't affect the live content which can lead to unexpected effects on the View Transition.

I find the inert recognizer the most useful pairing with useSwipeTransition but it's not the only way to do it. E.g. you can also have a scrollable surface that uses plain scrolling with snapping and then just progressively enhances swiping between steps.

[react-sizebot]

Comparing: 662957c...26dd20f

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	515.71 kB	515.71 kB	=	92.09 kB	92.09 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	565.64 kB	565.64 kB	=	100.84 kB	100.84 kB
facebook-www/ReactDOM-prod.classic.js	=	636.70 kB	636.70 kB	=	112.08 kB	112.08 kB
facebook-www/ReactDOM-prod.modern.js	=	627.02 kB	627.02 kB	=	110.50 kB	110.50 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 2134505

[Uzkjzjjzk]

hi