[WIP] [Feature] Implement custom auth guard for Shopify sessions and enable unit and feature testing.

[grahamsutton]

WHY are these changes introduced?

Fixes #466

Please review the changes and suggest feedback. I am still pending resolving one issue with how to dynamically provide the isOnline flag when loading the current Shopify session from the Shopify PHP library. I wanted to submit this now to incorporate feedback sooner before I remove this from being WIP.

Here's why I've decided to introduce these changes:

• Upgrading from Laravel 8 to Laravel 10: Laravel 8 has reached end of life https://laravel.com/docs/10.x/releases#support-policy. Upgrading the framework to Laravel 10 makes sure we're using a secure and reliable version of Laravel.
• Custom auth guard ShopifyGuard: Laravel provides many conveniences around when handling authentication through the framework, but the project in its current state bypasses Laravel's authentication (config/auth.php is completely commented out). Not being able to leverage framework benefits hurts developer productivity, causes a lot of code redundancy, and makes testing a pain (if not impossible).
• Enable testing: Currently the project has no tests directory despite having PHPUnit configured. Developers need to be able to write unit and feature tests. Developers should not have to resort to 100% manual testing. Enabling automated testing would decrease the number of bugs escaping into deployed Shopify apps and result in a better overall brand image.

WHAT is this pull request doing?

• Creates a custom auth guard called ShopifyGuard to return the currently authenticated session.
• \App\Models\Session model extends \Illuminate\Foundation\Auth\User and implements missing getAuthIdentifierName and getAuthPassword methods.
• Recreates the tests directory commonly found in fresh Laravel installations. The tests/TestCase.php class contains an overridden actingAs method that additionally injects a mock Authorization Bearer token. It also disables the Shopify middleware to allow requests in feature tests to reach the controller while still returning an authenticated \App\Models\Session instance.
• Adds Shopify API key and secret to config/services.php.
• Upgrades from Laravel 8 to the latest version of Laravel 10.

Checklist

Note: once this PR is merged, it becomes a new release for this template.

• I have added/updated tests for this change
• I have made changes to the README.md file and other related documentation, if applicable

[grahamsutton]

This is the isOnline flag. Any suggestions on how to dynamically populate this are welcome.

[grahamsutton]

I have signed the CLA!

[darrynten]

I think it makes more sense for this to be in web/config/shopify.php