R1:febd68039fdc

Add initial infrastructure for adding ModularTransaction support to Application config changes

Summary: Part of the groundwork for T11476.

Test Plan: ran `./bin/storage upgrade` and observed expected DB tables

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11476

Differential Revision: https://secure.phabricator.com/D17736