NodeContainerFormat transform methods dispose all the children

[Kaplas80]

Describe the bug
All the children are disposed after calling any Node transform method on a NodeContainerFormat.

To Reproduce
Steps to reproduce the behavior:
TransformNodeContainerProblem.zip
I've attached a demo to see the issue. After the TransformWith call, all the children are disposed.

Expected behavior
As the children have a new root node, they should remain undisposed.

[pleonex]

It's a difficult case because the lifecycle (dispose) ownership of the children nodes is shared in three different objects: the parent Node, the source NodeContainerFormat and the new NodeContainerFormat.

As discussed internally, we have found a specific workaround / new strategy for your use-case: use the Tags property of the Nodes and remove the intermediate converter.

But we need to think about this mess of shared lifecycle with the children nodes because this use case of converter NodeContainerFormat -> NodeContainerFormat copying some of the original Nodes is broken and we may find more issues in the future.