Add Config Modify Module to Open Social

Problem/Motivation/Resolution

The [Config Modify](https://www.drupal.org/project/config_modify/) module is a project we created to allow us to re-use the Update Helper's Configuration Update Definitions for configuration at install time.

For example this allows us to move our current permission set function calls to YML files but it also allows us to remove bridge modules such as `social_book_featured` by letting us modify form/view configuration automatically based on what modules are enabled.

Remaining tasks

User interface changes

API changes

Data model changes