R1:9c28ae9ba77d

Add more information (colors, members, watchers) to project.search

Summary: Fixes T6501. This adds more API information to the newish `project.search` API method.

Test Plan: Called `project.search`, used attachments.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T6501

Differential Revision: https://secure.phabricator.com/D15105