Convert `arc feature` to use `PhutilConsoleTable`.

Summary: Fixes T5110. `PhutilConsoleTable` handles Unicode characters and can display a decent-looking table.

Test Plan: {F167698}

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5110

Differential Revision: https://secure.phabricator.com/D9602