Is it possible to get a node layout relative to the root node?

Hi I have a question about using this library, in my application I need random access to any node's layout relative to a root node. It seems that the `TaffyTree::layout()` method only gives you the layout relative to the parent node. Is it possible to do a second pass to resolve all layouts relative to a root node or something like that? Will I have to roll my own tree using the low level API to do this?

Thanks

Start with the TaffyTree::layout() API and the low-level API mentioned in the issue, then inspect how layout coordinates are represented relative to parent nodes. Determine whether a root-relative second pass is supported or would require a new API; done means a clear supported approach or a scoped API change with accompanying tests.

Written by the indexing model from the issue text.