Sunburst plugin for neuron connectivity

[neomorphic]

This is a new plugin that will display the connectivity of a neuron in a "sunburst" plot. See attached pdf for an example.

In addition to the example, here a a few notes:

1. keep ‘input’ and ‘output’ for now but make that text much smaller
2. Only show the top few connections or ROIs (maybe at least 70% of the volume) and group smaller types or ROIs as”other”. “Other” will then have a pop-up for further breakdown.
3. Implement a very simple neuprint plugin that just takes a list of body ids and shows their sunburst chart
4. Provide a link for each body id in the np tables (e.g., where we have the skeleton link for np explorer) that allows this visualization to ‘pop-up’ as a modal
5. For each plot provide the following options: toggle multi-color vs 2 color mode, toggle between grouping by cell type and grouping by ROIs.