add cell type chart on study view

[inodb]

For the MSK SPECTRUM study we could add a violin chart for cell types:

We already have the X vs Y charts but they currently are limited to clinical attributes. An idea for the interface could be the following:

When selecting multiple and clicking add chart it could add a violin chart

Other thoughts:

• by default we could always add this chart if we detect a generic assay with numeric data and e.g. less than 100 elements (this would work for cell types and mutational signatures)
• the selection should be per row rather than across all cell types, begging the question whether this way of representing the data is ideal