Add traces to the GUI editor

[basbruss]

Most Node-red users are still using it because it has capabilities to visualize the nodes which is helpful by creating complex automations. HA has already a form of visualization of automations but it's only generated after a run of the automation.
In the HA editor as standing now it can be hard to see where you are in the logic especially when you use multiple triggers and/or choose actions.

What if we add a column or a tab (in mobile view) with an auto-generated trace while you add pieces to the automation?

To make it even more useful we should colorize the "node" that is selected in the editor.
Also, a pivot/full view button to a horizontal trace representation could be useful.