Add option to track the registration form URL

To use this feature, I think a custom implementation or https://www.drupal.org/project/formblock → is needed to get a registration block.

This will need quite the ambitious update hook.

https://www.drupal.org/project/formblock → is not D11 compatible.

Done. Please review!

Alright, tested it a bit and refactored the code, ready to review now!

Let's also integrate 📌 Add fallback option to track the parameter from current request, if cookie is empty Active here.

Ok really all done now. Please review!

Forgot the update hook.

Update hook works great!

Now this can finally get reviewed!

@Anybody would like a setting to enable the fallback tracking.

Alright, now time for review.

Great work, I left final comments.

Alright, all done!

Automatically closed - issue fixed for 2 weeks with no activity.