Add automatic code formatting for uniform code format

[GarrettBurroughs]

Alloy should have a uniform code format throughout to reduce errors and increase maintainability and readability as well as enforce a standard throughout the project

Here is a link to a good code formatter that can be used with Gradle: https://github.com/diffplug/spotless/tree/master/plugin-gradle

[GarrettBurroughs]

Done using the spotless code formatter