[UI] Add ability to render query plans

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do. I can currently download query plans in dot format from the scheduler REST API and then use graphviz to transform them into images. I would like to be able to view them directly in the UI as well.

Describe the solution you'd like Perhaps https://github.com/magjac/d3-graphviz will help

Describe alternatives you've considered None

Additional context None