[Visualizer] ability to highlight dependencies

**Is your feature request related to a problem? Please describe.**
With a very complex and large deployments it's a bit hard to track all the dependencies. Visualiser does help but with tens of resources it can get difficult to find dependency paths

**Describe the solution you'd like**
I'd like a way to highlight the dependency chain (in both ways, selectable) from a selected resource/module all the way to the root and/or leaf.
Also, ability to highlight root resources (that does not depends on any) would be beneficial.

No files, tests, or entry points are identified in the issue. Start by locating the Visualizer implementation and its dependency-graph selection handling; clarify how highlighting should work toward roots, toward leaves, in both directions, and for root resources. Done means the selected dependency paths and root resources are visibly distinguishable in complex deployments.

Written by the indexing model from the issue text.