Attach Diffusion Pagers to their ObjectBoxView

Summary: Adds the ability to set a pager onto an object box directly and pick up appropriate styles.

Test Plan: grep for renderTablePagerBox, test layouts with and without a pager.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12604

Differential Revision: https://secure.phabricator.com/D17754