[TableView] Interactive empty state support

[matthewdeutsch]

When using TableView empty state

Behavior changes:

• Grid keyboard navigation becomes disabled when the TableView is empty. Additionally, the select all checkbox and column headers become non-interactive.
• The content within the IllustratedMessage will become tabbable
• Grid role is preserved

Outstanding questions:

• make the TableView itself tabbable?
• would apply to other collection views as well?