In Packages, give publishers a list of packages and packages a list of versions

Summary: Ref T8116. Puts a list of packages on the publisher page, and a list of versions on the package page.

Test Plan: Viewed a publisher, saw packages. Viewed a package, saw versions. Looked at list views.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8116

Differential Revision: https://secure.phabricator.com/D16321