RoomDisplayNameFallbackProvider

This interface exists to let the implementation provide localized room display name fallback. The methods can be called when the room has no name, i.e. its m.room.name state event does not exist or the name in it is an empty String. It allows the SDK to store the room name fallback into the local storage and so let the client do queries on the room name. Limitation: if the locale of the device changes, the methods will not be called again.