List: Add Component

[ItsJonQ]

We need to add a List component, resembling that seen in the screenshot above. The screenshot is of Bootstrap's ListGroup.

The idea is for this list container to render a collection of items. These items may be actions (or links) or non-actionable content. The items may be border separated, they may not. The list may be bordered, it may not.

The best example may be Ant Design's List component: https://ant.design/components/list/

Another good example would be Material UI's List component: https://material-ui.com/components/lists/

List may serve as the base UI for FlatList, where FlatList would be responsible for things like windowing, drag sorting, etc...

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Note: We currently have a List component. However, this one is more like an enhanced ul/ol. We can refactor that to be something like UnorderedList and OrderedList.

[ItsJonQ]

We may also need to consolidate (or replace) the existing Menu component with this new List.

[ItsJonQ]

A (potential) real world need for this component would be for the new Global Styles design: https://github.com/WordPress/gutenberg/issues/27473#issuecomment-796773866

(Note: The List UI in the middle rendering)