Add a feature flag for automatic back pagination. (#5445)

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

@@ -55,6 +55,7 @@ protocol DeveloperOptionsProtocol: AnyObject {
     var enableKeyShareOnInvite: Bool { get set }
     var hideQuietNotificationAlerts: Bool { get set }
     var focusEventOnNotificationTap: Bool { get set }
+    var automaticBackPaginationEnabled: Bool { get set }
     
     var hideUnreadMessagesBadge: Bool { get set }
     var elementCallBaseURLOverride: URL? { get set }

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

@@ -67,6 +67,11 @@ struct DeveloperOptionsScreen: View {
                 Toggle(isOn: $context.lowPriorityFilterEnabled) {
                     Text("Low priority filter")
                 }
+                
+                Toggle(isOn: $context.automaticBackPaginationEnabled) {
+                    Text("Automatic back pagination")
+                    Text("Requires app reboot")
+                }
             }
             
             Section("Room") {
@@ -135,6 +140,7 @@ struct DeveloperOptionsScreen: View {
                     Text("Hide quiet alerts")
                     Text("The badge count will still be updated")
                 }
+                
                 Toggle(isOn: $context.focusEventOnNotificationTap) {
                     Text("Focus event on notification tap")
                 }