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/Screens/Settings/DeveloperOptionsScreen/DeveloperOptionsScreenModels.swift

@@ -53,6 +53,7 @@ protocol DeveloperOptionsProtocol: AnyObject {
     var elementCallBaseURLOverride: URL? { get set }
     var fuzzyRoomListSearchEnabled: Bool { get set }
     var pinningEnabled: Bool { get set }
+    var timelineItemAuthenticityEnabled: Bool { get set }
 }
 
 extension AppSettings: DeveloperOptionsProtocol { }

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/View/DeveloperOptionsScreen.swift

@@ -50,6 +50,13 @@ struct DeveloperOptionsScreen: View {
                     Text("Fuzzy searching")
                 }
             }
+            
+            Section("Encryption") {
+                Toggle(isOn: $context.timelineItemAuthenticityEnabled) {
+                    Text("Message authenticity warnings")
+                    Text("Requires app reboot")
+                }
+            }
                                     
             Section("Element Call") {
                 TextField(context.viewState.elementCallBaseURL.absoluteString, text: $elementCallBaseURLString)