feat: add onDemand

Author: AliAkhgar

ios/Openvpn.mm

@@ -49,7 +49,7 @@ - (void)connect:(JS::NativeOpenvpn::ConnectionParams &)params resolve:(nonnull R
 
   self.providerManager.localizedDescription = @"F1VPNs OpenVPN";
   [self.providerManager setEnabled:YES];
- [self.providerManager setOnDemandEnabled:NO];
+  [self.providerManager setOnDemandEnabled:YES];
   [self.providerManager setProtocolConfiguration:tunel];
 
  [self.providerManager saveToPreferencesWithCompletionHandler:^(NSError *error) {
@@ -125,7 +125,7 @@ - (void)prepare:(nonnull RCTPromiseResolveBlock)resolve reject:(nonnull RCTPromi
 
     NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
     self.vpnStateObserver = [center addObserverForName:NEVPNStatusDidChangeNotification
-                                                object:self.providerManager.connection
+                                                object:nil
                                                  queue:nil
                                             usingBlock:^(NSNotification *notification) {
           NEVPNConnection *nevpnConnection = (NEVPNConnection *)notification.object;