Summary: Ref T8726. Continue making Herald fields more modular than they currently are.
Test Plan:
- Created a rule using all the affected fields.
- Ran the rule.
- Saw reasonable object field values.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: eadler, joshuaspence, epriestley
Maniphest Tasks: T8726
Differential Revision: https://secure.phabricator.com/D13495