Create useContentRect hook

[leroykorterink]

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[ThaNarie]

I'm wondering why the state version of this hook uses a different implementation (raf), and why those two implementations can't use each-other or a shared function as a base :)

[leroykorterink]

I'm wondering why the state version of this hook uses a different implementation (raf), and why those two implementations can't use each-other or a shared function as a base :)

@ThaNarie for the ref version we don't have to use a request animation frame to keep everything running smoothly. The resize observer callback should update every frame, but doing state updates more often is not desirable.