Internal ID mapping in case of custom idAccessor

[aliaksandr-yanchuk]

Hi and thanks for a great tree component, really awesome!

I've noticed one thing, when in case of custom idAccessor (e.g. uid instead of id), internal logic is still relying on "id" in some places. For example drag and drop reorder/move works through useSimpleTree and there goes direct mapping through id, without check for idAccessor property.

Best regards, Alexander Yanchuk