Speed up topology unbuild

[carlos-jenkins]

Currently the topology unbuild is implemented as a sequential node destruction.

Node destruction is implemented as a destroy, remove, and wait sequence.

We can speed up the unbuild by calling the destroy and remove of all nodes first, then wait until all of them are removed.

This can implement this as threads (consider GIL), or refactor the workflow. We also need to consider the the hooks interfaces defined by the core framework.