Listview component (for lack of better naming)

[mgambill]

The Listview (or whatever we call it) would be the same as the listbox with the following changes:

1. it doesn't need the open/close functionality
2. left / right keys would trigger up/down actions. since the developer could be creating vertical or horizontal controls
3. multi-select would be nice

This component would allow for developers to build various components: tabs, accordions, sidebars... etc.

I've got a working prototype here:
https://codesandbox.io/s/xenodochial-montalcini-qc1f9?file=/src/components/listbox/listbox.ts

[madmod]

This could be used to make a keyboard navigable 2d grid which could be very nice. (Think Netflix UI on tvs)