use isDM from the SDK to determine if a spaceRoom, a joinedRoom or a notificationItem are from a dm room.

ElementX/Sources/Services/Room/RoomMember/RoomMemberProxyProtocol.swift

@@ -25,6 +25,8 @@ protocol RoomMemberProxyProtocol: AnyObject {
     var isIgnored: Bool { get }
     
     var powerLevel: RoomPowerLevel { get }
+    
+    var isServiceMember: Bool { get }
 }
 
 extension RoomMemberProxyProtocol {