replace useReducer with useState

[knaveenkumar3576]

This PR includes three changes:

useDroppable function: Changed useIsomorphicLayoutEffect to useEffect
Although setting state in a layout effect is useful for measuring the DOM, in this case, it only registers droppable elements during the first render. It can wait until later without causing any UI flickers.

useRect function: Replaced useReducer with useState.
Switched to useState because useReducer causes nested updates due to the lack of a bailout mechanism.

useRects function: Replaced useReducer with useState.
Switched to useState because useReducer causes nested updates due to the lack of a bailout mechanism .

Please review @clauderic

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Latest commit: 5a72450

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