Add support to use requestAnimationFrame for render frames in preview

[yuta0801]

This PR adds option to use requestAnimationFrame for play frames instead of setTimeout.

It was just an idea but it improves FPS greatly, especially effective for BetaText in examples.

[JonnyBurger]

Brilliant! 💡

It indeed seems to be faster. I'm not convinced its because of RAF, but I believe it's because of the useRef technique you used.

2 things:

• I only add to lastFrames if actually triggering a rerender - don't wanna show 60FPS if composition is defined as only 10fps
• There was a one-off bug in FPS calculation - I fixed it

Result: BetaText example plays in perfect 30.0 FPS!! 🥳
Before it showed like 27.8FPS and in actuality it was even slower because of the bug. You can see the improvement with your own eyes! Thanks a lot 💙