feat(DragControls): Pass through useGesture handlers

[astralarya]

Why

useGesture, the underlying library for DragControls, supports passing handlers such as onClick to be called seamlessly during gesture handling. This enables us to call things like event.stopPropagation() to occlude raycast events from React Three Fiber.

What

Add a handlers prop, which is spread into the useGesture call.

Checklist

• Documentation updated (example)
• Ready to be merged

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