Add InteractionCard component

[tchock]

Currently the Card component is quite plain. As we often use the Card component as an interactive/button-like component there should be a special variant that has the following properties:

• Pointer cursor
• Visible hover state (e.g. slightly darker)
• Visible active state after click (e.g. a bit darker than hover state)
• Uses button instead of div
• Focusable (with outline we use for the others)