:sparkles: Allow anyone to create an application

As a sugoi user, I would like to be able to create an application and add group (and user to this application). At the moment, application creation is reserved to realm admins, so I have to ask them to create the application and give me rights to it.

This should be configurable by realm, and if enabled, any reader on the realm should have the rights to create application. When application created, the user should have all rights on it.

The user creating application should also have a right to delete it.