R1:a8c4da13c0be

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.