R1:8cdd801515ac

Add PhabricatorOwnersPackageQuery

Summary:
This is a step toward unearthing Project queries enough that I can make them policy-aware. Right now, some ProjectQuery callsites do not have reasonable access to the viewer. In particular, Owners packages need to issue Project queries because we allow projects to own packages and resolve project members inside of some package queries.

Currently, we have a very unmodern approach to querying packages, with a large number of one-off static load methods…