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/RoomMemberProxy.swift

@@ -51,4 +51,8 @@ final class RoomMemberProxy: RoomMemberProxyProtocol {
     var powerLevel: RoomPowerLevel {
         .init(rustPowerLevel: member.powerLevel)
     }
+    
+    var isServiceMember: Bool {
+        member.isServiceMember
+    }
 }