Add a "status" property to Almanac devices

Summary:
Ref T13641. Add a "status" property with most of the relevant support code.

This currently has no impact on use of the device or bindings by Diffusion or Drydock: they ignore the status of devices bound to services.

Test Plan:

• Created a new device.
• Changed the status of a device via web and API.
• Queried for devices via API.
• Searched for active and disabled devices.
• Viewed UI in list view, detail view.
• Used typeahead to add a new binding to an interface on a disabled device, got disabled hint in typeahead UI.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13641

Differential Revision: https://secure.phabricator.com/D21627