fix(react): ensure event callbacks are updated on changes

[jamsinclair]

Fixes #249

Problem

The hook does not correctly update the event callbacks passed through in the options. This results in stale references when the callbacks are invoked.

Solution

Update to keep track of the callbacks in refs and call these in the callbacks registered to the core draggable instance.

Update the callback refs to ensure they remain up-to-date in the existing useEffect that has a dependency on options

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Question: Will this also need to be fixed in v3?

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Latest commit: b53a41b

The changes in this PR will be included in the next version bump.

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@neodrag/react	Patch

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[jamsinclair]

I think this useEffect retriggers on every re-render unless the consumer passes a stable options object reference to the useDraggable hook.

I don't think this will cause any performance concerns. If for some odd reason it does, the consumer can always wrap their object in useMemo or alternative solutions.