What's the problem this feature will solve?
Currently, each agent variable can only be plotted in separate figures. The virus on a network example is one such use case where we want to plot everything in one figure. See mesa/mesa-examples#56 (comment).

Describe the solution you'd like

Supporting this could be as simple as detecting if measure in https://github.com/projectmesa/mesa/blob/734496c641d0dcc5d05832d5c530b4badad08e4a/mesa/experimental/jupyter_viz.py#L287 is a list. If so, plot all of them in 1 figure.