Add an "event log" card for sensors such as door open/close sensors

Feature Requests
1

It would be immensely useful to have an “event log” card in the main UI that displays the last X activations of a binary sensor. For example, it would be great to see a card with

Door opened: 
    8:35 AM
    8:40 AM
    1:00 PM
    1:33 PM
    2:45 PM
    5:30 PM

as this would allow you to immediately notice that someone had opened a door at an odd time.

I also imagine this being useful for most other security sensors (motion, noise, etc), as well as any custom sensors you might have for monitoring (e.g. monitoring when someone opened a fridge0