Add "almanac.network.edit" and "almanac.network.search" API methods

Summary: Depends on D19334. Ref T13120. Ref T12414. These are pretty straightforward, but no one really has a use case for them anyway today so they're primarily just for completeness.

Test Plan:

• Queried networks with almanac.network.search.
• Created and edited networks with almanac.network.edit.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13120, T12414

Differential Revision: https://secure.phabricator.com/D19335