Show Encryption Authenticity warnings on messages in the timeline. (#3051)

* Initial implementation.

* Add developer option for showing timeline item authenticity.

* Refactor code to use new SendInfo.Status.

---------

Co-authored-by: Doug <douglase@element.io>

ElementX/Sources/Services/Timeline/TimelineItems/EventBasedTimelineItemProtocol.swift

@@ -50,7 +50,11 @@ extension EventBasedTimelineItemProtocol {
     var pollIfAvailable: Poll? {
         (self as? PollRoomTimelineItem)?.poll
     }
-
+    
+    var hasStatusIcon: Bool {
+        hasFailedToSend || properties.encryptionAuthenticity != nil
+    }
+    
     var hasFailedToSend: Bool {
         properties.deliveryStatus == .sendingFailed
     }
@@ -74,8 +78,8 @@ extension EventBasedTimelineItemProtocol {
             whiteSpaces += 1
         }
 
-        // To account for the extra spacing created by the alert icon
-        if hasFailedToSend {
+        // To account for the extra spacing created by the status icon
+        if hasStatusIcon {
             whiteSpaces += 3
         }