Add summary table data view renderer

[RandomFractals]

to preview metrics and data spreads in datasets.

see this OJS notebook for example: https://observablehq.com/@randomfractals/chicago-taxi-trips

& summary table component: https://observablehq.com/@observablehq/summary-table

[RandomFractals]

this was brutal. still need to patch svg plots positioning and sizing. looks like vscode just applies 20px width to all svg elements in a notebook view (for their buttons probably :)

[RandomFractals]

still a few things to fix in this view: