fix: skip creating the observer if nothing changed

[thebuilder]

Fix for #359 - Ensure that we don't recreate the InteresectionObserver if the node and options are are the same.

This happens when wrapping the ref without using useCallback.

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[thebuilder]

Seems like this doesn't actually work. 😔

React makes a call with null as the node before it switches to the new (same) node, so it still enters the same infinite loop.