BREAKING CHANGE: Changes User class to Authenticatable interface, adds PHP / Laravel requirements, adds tests and ci

[zackAJ]

BREAKING CHANGE

• Updates composer PHP and laravel requirements (see composer.json).
• Report tracking now gives Authenticatable interface instead of User class when it comes to the currently authenticated user, this is consistent with laravel's Auth::user() return type.

Testing

• Adds feature tests.

CI

• Adds testing workflow.
• Adds Pint code styling workflow.