iOS demo for the p2p-webrtc video-transform example

examples/p2p-webrtc/video-transform/client/ios/SimpleChatbot/model/MockCallContainerModel.swift

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+import SwiftUI
+import PipecatClientIOS
+
+class MockCallContainerModel: CallContainerModel {
+    
+    override init() {
+        super.init()
+        let liveMessageFromSystem = LiveMessage(
+            content: "System message",
+            type: .system,
+            updatedAt: Date()
+        )
+        let liveMessageFromUser = LiveMessage(
+            content: "Message from User",
+            type: .user,
+            updatedAt: Date()
+        )
+        let liveMessageFromBot = LiveMessage(
+            content: "Message from bot",
+            type: .bot,
+            updatedAt: Date()
+        )
+        self.messages = [ liveMessageFromSystem, liveMessageFromUser, liveMessageFromBot ]
+    }
+
+    override func connect(backendURL: String) {
+        print("connect")
+    }
+    
+    override func disconnect() {
+        print("disconnect")
+    }
+    
+    override func showError(message: String) {
+        self.toastMessage = message
+        self.showToast = true
+        // Hide the toast after 5 seconds
+        DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
+            self.showToast = false
+            self.toastMessage = nil
+        }
+    }
+}