Handle Room Routing using the membership state (#2154)

ElementX/Sources/Services/Room/RoomProxy.swift

@@ -131,6 +131,10 @@ class RoomProxy: RoomProxyProtocol {
         room.membership() == .joined
     }
     
+    var membership: Membership {
+        room.membership()
+    }
+    
     var isDirect: Bool {
         room.isDirect()
     }

ElementX/Sources/Services/Room/RoomProxyProtocol.swift

@@ -55,6 +55,7 @@ protocol RoomProxyProtocol {
     var isSpace: Bool { get }
     var isEncrypted: Bool { get }
     var isTombstoned: Bool { get }
+    var membership: Membership { get }
     var hasOngoingCall: Bool { get }
     var canonicalAlias: String? { get }
     var alternativeAliases: [String] { get }