Add a developer option button for marking every single room as read (#5582)

This will use an underlying SDK method and send a private read receipt plus a fully read marker in every single room the user is part of. It will most likely be a long operation that will get rate limited so the task is set to run detached for as long as it takes.

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

@@ -10,6 +10,7 @@ import SwiftUI
 
 struct DeveloperOptionsScreen: View {
     @Environment(\.dismiss) private var dismiss
+    @State private var showMarkAllRoomsAsReadAlert = false
     
     @Bindable var context: DeveloperOptionsScreenViewModel.Context
     
@@ -130,6 +131,26 @@ struct DeveloperOptionsScreen: View {
                 }
             }
             
+            Section {
+                Button {
+                    showMarkAllRoomsAsReadAlert = true
+                } label: {
+                    Text("Mark all rooms as read")
+                }.alert("Are you sure you want to mark all the rooms as read?", isPresented: $showMarkAllRoomsAsReadAlert) {
+                    Button("Cancel", role: .cancel) { }
+                    
+                    Button("Yes") {
+                        context.send(viewAction: .markAllRoomsAsRead)
+                    }
+                }
+            } footer: {
+                Text("""
+                This will send a private read receipt and a read marker in every room you are part of. \ 
+                It's a long running operation that might get rate limited. \
+                It will run in the background but the app must be alive for it to finish.
+                """)
+            }
+            
             Section {
                 Button {
                     showConfetti = true