Consider adding support for visualization type and subtype

[ghost]

Consider adding support for subtypes in supported visualizations.

Chart is very vague. What was #7 ended up being "Death Count per Personality Type" chart. While we could just add it to supported list and render it directly, I think it makes more sense to have something like this in supported visualizations response:

interface SupportedVisualization {
    type: string;
    subtype: string;
    prompt: string;
}

type and subtype would be used to vary between visualizations. Could be chosen with rendered buttons or a dropdown. Would need some UX input to determine.

prompt would be used to display message for user on the button/dropdown as Death Count per Personality Type should not be considered a valid subtype, but it'd be good for UX.

What do you guys think @Lauralicja @czaaru ?

[Lauralicja]

Type: what do we want to see, Death/Money...
Subtype: how do we want to see, Chart/Boxplot/Map