[ALOY-192] Make sql_model test app behave like a true app

Right now the [sql_model](https://github.com/appcelerator/alloy/tree/master/test/apps/sql_model) test app doesn't behave much like a normal app. It performs a few model/collection operations under the hood and exposing very little of that via the UI. Also, there is no interactivity in the app. There's a few options:

Eliminate the existing sql_model test app after ALOY-191 is completed

Keep the existing sql_model test app, but make it behave like a true app. It would also need to exhibit sql-specific functionality to make it worth keeping. So it would need to use SQL queries to access models and collections from its persistent storage. Without the SQL-specific code, it may as well just be showcased by the app created in ALOY-191.