Able to stop observing with nullish callback

[hooriza]

There is no way to stop intersection observing now.
So I want to able to it with this change.

const handleObserve = useCallback(() => {}, []);
const [isObserving, setIsObserving] = useState(true);

const intersectionObserverRef = useIntersectionObserverRef(isObserving ? handleObserve : undefined);

return (
    <div>
        <div ref={intersectionObserverRef}>target</div>
        <button onClick={() => setIsObserving(false)}>stop observing</button>
    </div>
);

[imbhargav5]

This makes sense. But I am just going to think over the API for a bit and see if there is anything else we can do here or come up with a slightly different API.

[codecov]

Codecov Report

Merging #889 (4c2ce61) into main (1a66ed3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #889   +/-   ##
=======================================
  Coverage   91.09%   91.09%           
=======================================
  Files          67       67           
  Lines        3929     3929           
  Branches      662      662           
=======================================
  Hits         3579     3579           
  Misses        346      346           
  Partials        4        4           

Impacted Files	Coverage Δ
src/hooks/useIntersectionObserverRef.ts	75.00% <100.00%> (ø)

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[imbhargav5]

Cool this makes sense to me.

[github-actions]

🎉 This PR is included in version 5.10.3 🎉

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