My answer 1: The Contact sensor can, via the Hue app, trigger all (or some) lights in one (or more) room(s) or zone(s). You can therefore "control" an outlet in one or other location. The app will simply point out that it's not wise to leave such an accessory unattended. It's up to you to ignore this warning.
My answer 2: The Contact sensor does not appear, on the day and at the time of my reply, as a light or as an accessory in the automations of the official Hue app. Does it appear in a third-party application? I'm not sure.
I hope I've answered your questions.