room directory settings
As a user I would like to decide during room creation and in the room settings, whether my room can be found though the room directory.
The search itself is already implemented in https://gitlab.com/connect2x/trixnity-messenger/trixnity-messenger/-/blob/main/trixnity-messenger/src/commonMain/kotlin/de/connect2x/trixnity/messenger/viewmodel/roomlist/SearchGroupViewModel.kt, but effectively cannot yet be used because rooms can not be added to nor removed from the directory through trixnity-messenger.