Right click handler/renderer for marks

It would be great if we could set a right click handler (or some sort of rendering mechanism) that would allow us to render something when we right click on the mark.

I imagine that 99% of the time this would be for a context menu, but it should be flexible enough to allow for anything to be rendered on right click.

This would take advantage of #159 in that the row and column data, and associated metadata would be passed to this render method.

An example would be the following. Let's say I have the following object used in the explorer:

{
    eventId: 1,
    description: 'some event',
    start: '2019-12-25',
    end: '2019-12-26'
}

Along with the associated metadata for the columns (it's assumed the keys are related to the properties above):

{
    eventId: { adminPageRoot: '/admin/events/' }
}

Then, in the render method, all this information could be put together to render a link with the following URL:

/admin/events/1

Which would allow someone right clicking on that mark to be taken to a page related to that specific mark (and it's type).

Start by reviewing the existing mark interaction and rendering paths, then read issue #159 to understand the row, column, and metadata context it provides. Done should include a defined right-click rendering or handler mechanism that can receive the associated mark data and support the described context-menu use case.