WireguardApp: iOS: Added Siri shortcuts donations for SetTunnelStatus intent

Signed-off-by: Alessio Nossa <alessio.nossa@gmail.com>

Sources/WireGuardApp/UI/iOS/ViewController/TunnelDetailTableViewController.swift

@@ -2,6 +2,7 @@
 // Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
 
 import UIKit
+import Intents
 
 class TunnelDetailTableViewController: UITableViewController {
 
@@ -387,6 +388,18 @@ extension TunnelDetailTableViewController {
         cell.onSwitchToggled = { [weak self] isOn in
             guard let self = self else { return }
 
+            let intent = SetTunnelStatusIntent()
+            intent.tunnel = self.tunnel.name
+            intent.operation = .turn
+            intent.state = isOn ? .on : .off
+            let interaction = INInteraction(intent: intent, response: nil)
+            interaction.groupIdentifier = "com.wireguard.intents.tunnel.\(self.tunnel.name)"
+            interaction.donate { error in
+                if let  error = error {
+                    wg_log(.error, message: "Error donating interaction for SetTunnelStatusIntent: \(error.localizedDescription)")
+                }
+            }
+
             if self.tunnel.hasOnDemandRules {
                 self.tunnelsManager.setOnDemandEnabled(isOn, on: self.tunnel) { error in
                     if error == nil && !isOn {