Allow to plot multiple node colors in mne_connectivity.viz.plot_connectivity_circle

[JohannesWiesner]

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Describe the problem

Would be nice if node_colors could also be multiple colors. This would be useful so you could e.g. plot two colors for the different brain hemispheres and a another layer of colors for different brain lobes.

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Additional context

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[larsoner]

@JohannesWiesner to me this is the sort of thing that could hopefully be done to the figure after mne-connectivity creates it. At the end of the day we just produce a matplotlib figure with axes, collections, etc. Can you see if you can get what you need by accessing fig.axes[0].collections or similar to get the correct nodes, then setting properties like fill color or edge color, and/or plotting a second collection/scatter (or whatever we create under the hood!) to achieve the effect of interest? If it works I think it could make a cool example rather than new feature that we build into the plotting function.

[JohannesWiesner]

Will try and report back :)