Various sliding sync tweaks (#446)

* Refactor SS configuration and add (unfinished) support for adding views dynamically.

* Implement pop and clear support on the room summary provider

* Register views against sliding sync

* Read invalidated vislbeRoomsSummaryProvider from the allRoomSummaryProvider

* Switch SS window range setting from the ScrollViewAdapter to a publisher debounce

* Tweak allRoomsView addition: switch from listening the visibleRoomsView's state to when it publishes the first diff update

* Cleanup client delegate and sliding sync observers and lifecycle

* Bump the RustSDK to 1.0.30-alpha

* Reuse startSync within restartSync

ElementX/Sources/Services/Client/MockClientProxy.swift

@@ -40,8 +40,6 @@ class MockClientProxy: ClientProxyProtocol {
     
     func stopSync() { }
     
-    func restartSync() { }
-    
     func roomForIdentifier(_ identifier: String) async -> RoomProxyProtocol? {
         guard let room = visibleRoomsSummaryProvider?.roomListPublisher.value.first(where: { $0.id == identifier }) else {
             return nil