Epic #84044: Admin Panel Rework
Refactor admin panel module registration
Currently the class `AdminPanelView` is one big class containing all code logic for rendering the admin panel.
For better extendibility and cleaner code, the modules should be extracted to own classes, an interface for a module should be added and a flexible registration possibility should be provided.
In a first step, the interface will be declared as internal to make it possible to change the interface during the admin panel rework.