Implement a project logic datasource

Summary:
Ref T4100. Ref T5595. This allows you to execute all "Projects", "Any Project", "Not in projects" and "include no projects" operations in one field.

It doesn't actually implement such a field yet.

Test Plan: {F375516}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5595, T4100

Differential Revision: https://secure.phabricator.com/D12460