Add a StatelessAuthBehavior to supply necessary model methods.

This would give the plugin a way to provide the necessary functionality required to use the `TokenLoginLogoutAuthenticate` object, by injecting general `login()`, `logout()` and `findForToken()` methods into an existing Model.

Start by reading the TokenLoginLogoutAuthenticate object and the existing model integration points to determine which methods it requires. Define how a StatelessAuthBehavior would inject login(), logout(), and findForToken() into an existing Model, then verify that the object can use those methods through the behavior.

Written by the indexing model from the issue text.