text user interface for most rostopic/rosnode info functionality

[lucasw]

I made ros_tui.py to more quickly do the equivalent of rostopic info or rosnode info and be able to for example follow a topic to a subscribing node to a topic published by that node and so on quicker than the cli equivalent so I could debug broken launch files where I've disconnected/renamed some topics. (It would be nice to color code topics by whether they publishers and no subscribers or the other way around, or if they have multiple publishers)

ros_tui.mp4

It uses asccimatics, but if there is interest maybe it could be adapted to use termgraphics here? It would be very nice to add a capability to select any topic and have the rosshow visualization pop up (or if no rosshow support it could just show the equivalent of rostopic echo).