Introduce DrydockQuery to slightly reduce code duplication

Summary: Ref T2015. All the Drydock query classes share the application method; move it into a shared base class to slightly shrink the codebase.

Test Plan: Browsed query UIs.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2015

Differential Revision: https://secure.phabricator.com/D7837