Group and order Herald fields
Summary:
Ref T8726. Some adapters now have a large number of fields, and we lost the sort-of-human-readable implicit ordering when fields were modularized.
Instead, group and sort fields.
Test Plan:
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T8726
Differential Revision: https://secure.phabricator.com/D13619