Move database store to shared app group container
Summary
As a developer, I want to move where the Realm database is stored into a shared app group container so that it can be read from both the main app and any extensions that we may add in the future.
This requires the use of the App Groups entitlements, which are only available with a paid developer account. Because of this, we need to implement some sort of dummy data to enable anyone to help contribute to the project without sharing certificates openly.