New SlidingSync flow (#373)

* Switch back to using slidingSync rooms for timeline listeners

* Expose 2 types of slidingSync views from the clientProxy and combine their results for the roomList

* Fix breaking api changes

* Remove sender mxids from the room list (until rust provides resolved display names)

* Bump RustSDK to v1.0.22-alpha

* Rename originServerTs to timestamp throughout

* Simplified sliding sync view list merging

* Rollback some SS changes as things still don't work properly

* Revert "Switch back to using slidingSync rooms for timeline listeners"

This reverts commit 1d6a6c09d8ddf386edefbe0ac6beaf52cc333fba.

ElementX/Sources/Services/Timeline/TimelineItemProxy.swift

@@ -91,12 +91,8 @@ struct EventTimelineItemProxy: CustomDebugStringConvertible {
         item.reactions()
     }
     
-    var originServerTs: Date {
-        if let timestamp = item.originServerTs() {
-            return Date(timeIntervalSince1970: TimeInterval(timestamp / 1000))
-        } else {
-            return .now
-        }
+    var timestamp: Date {
+        Date(timeIntervalSince1970: TimeInterval(item.timestamp() / 1000))
     }
     
     // MARK: - CustomDebugStringConvertible