graph gets re-rendered when nodeTypes/edgeTypes change

[chrtze]

When the nodeTypes object is created inside the render function of a component without using useMemo, the graph gets re-rendered infinitely. Maybe we can check if the keys of the nodeTypes object change or show a warning when something like this happens.

const InfiniteRender = () => {
  const nodeTypes = {
    foo: Bar
  };

  const onNodesChange = () => {
    ...
  }


  return <ReactFlow onNodesChange={onNodesChange} nodeTypes={nodeTypes} />
}