Implement "almanac.interface.search" and "almanac.interface.edit"

Summary: Depends on D19337. Ref T13120. Ref T12414. These are slightly more substantive than namespace/network, but pretty much standard fare.

Test Plan:

• Searched for interfaces with "almanac.interface.search".
• Created and edited interfaces with "almanac.interface.edit".
• Created and edited interfaces with web UI since some stuff got tweaked.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13120, T12414

Differential Revision: https://secure.phabricator.com/D19338