Add support for sliding sync cold cache

ElementX/Sources/Services/Client/ClientProxy.swift

@@ -94,6 +94,7 @@ class ClientProxy: ClientProxyProtocol {
                 let slidingSync = try slidingSyncBuilder
                     .addView(v: slidingSyncView)
                     .withCommonExtensions()
+                    .coldCache(name: "ElementX")
                     .build()
                 
                 self.roomSummaryProvider = RoomSummaryProvider(slidingSyncController: slidingSync,

ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift

@@ -81,6 +81,12 @@ class RoomSummaryProvider: RoomSummaryProviderProtocol {
         
         let weakProvider = WeakRoomSummaryProviderWrapper()
         
+        rooms = slidingSyncView.currentRoomsList().map { roomListEntry in
+            buildSummaryForRoomListEntry(roomListEntry)
+        }
+        
+        roomListPublisher.send(rooms) // didSet not called from initialisers
+        
         weakProvider.stateUpdatePublisher
             .map(RoomSummaryProviderState.init)
             .subscribe(statePublisher)