Implement config settings page

Hi @danielspeicher I just thought about this one again:

List of possible entities to sync based on interfaces

I think we can skip that, since it's not really needed. Other modules using this module will be calling the action plugins or the services directly, and their method declarations are limiting this already, so that the function calls will already make sure, that the correct entity types will be passed in as arguments.

Ok, that is great. Since it is less to do here.

see https://www.drupal.org/project/invoice_ninja/issues/3412583 📌 Implement methods to synchronize Needs review

This looks great.

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