Add developer option to hide media in the timeline. (#3366)

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

@@ -44,9 +44,10 @@ protocol DeveloperOptionsProtocol: AnyObject {
     var logLevel: TracingConfiguration.LogLevel { get set }
     var slidingSyncDiscovery: AppSettings.SlidingSyncDiscovery { get set }
     var hideUnreadMessagesBadge: Bool { get set }
-    var elementCallBaseURLOverride: URL? { get set }
     var fuzzyRoomListSearchEnabled: Bool { get set }
+    var hideTimelineMedia: Bool { get set }
     var enableOnlySignedDeviceIsolationMode: Bool { get set }
+    var elementCallBaseURLOverride: URL? { get set }
 }
 
 extension AppSettings: DeveloperOptionsProtocol { }

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

@@ -45,6 +45,12 @@ struct DeveloperOptionsScreen: View {
                 }
             }
             
+            Section("Timeline") {
+                Toggle(isOn: $context.hideTimelineMedia) {
+                    Text("Hide image & video previews")
+                }
+            }
+            
             Section {
                 Toggle(isOn: $context.enableOnlySignedDeviceIsolationMode) {
                     Text("Exclude not secure devices when sending/receiving messages")