Separate daemon task table rendering into a standalone class

Summary: Ref T5402, T6238. Pull this out into a class so the Instances app can embed task views.

Test Plan: Loaded /daemon/ and examined the content in the tables.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T6238, T5402

Differential Revision: https://secure.phabricator.com/D11090