Provide ConsoleView classes for "[ OKAY ] Good things happened." console lines

Summary:
Ref T12996. CLI tools are increasingly standardizing on the output format with a colored "OKAY", "FAIL", "SKIP", "STORAGE UPGRADE", "DEPLOY", etc., in the leftmost column for easy scanning.

However, we have like 20 different things that each render it on their own. Add a 21st in libphutil, in hopes that we can have fewer than 21 some day.

Test Plan: Used this to render a lint success message in D18645.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T12996

Differential Revision: https://secure.phabricator.com/D18646