Allow setting of Archive/Active on Paste

Summary: Ref T9076, adds basic plumbing for setting the state of a Paste.

Test Plan: Archive Paste, Activate Paste, New Paste

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9076

Differential Revision: https://secure.phabricator.com/D13801