Add support for `scrollMargin` field

[du33169]

Is your feature request related to a problem? Please describe.

The IntersectionObserver API has supported a scrollMargin option since last year (MDN). It appears as a field hint when programming in an IDE because our IntersectionOptions extends the browser's IntersectionObserverInit interface (here).

However, only the explicitly defined fields are destructured and used in useInView.

As a result, scrollMargin is silently dropped and has no effect or warning.

Describe the solution you'd like

useInView (and other APIs) should forward scrollMargin to IntersectionObserver.

Describe alternatives you've considered

It might be better to preserve any unused IntersectionObserverInit fields when passing them through, in case there are future updates to the API.

Additional context

Version of react-intersection-observer: 10.0.3

[pupuking723]

I'd like to work on this. I'll first verify how options are forwarded on the current main branch and add a focused regression test for scrollMargin before changing the implementation.\n\nIf the browser support or API shape requires a different direction, I'll report back here before opening a PR.