[Request]: Return if the connection uses a VPN instead of returning VPN as a result

### Plugin

connectivity_plus

### Use case

When using the plugin to detect if the user is on mobile data, vs non metered networks currently there is no way to tell if a user is connected when using a VPN. Because only VPN is returned we can't know if it's actually connected to the internet, or if it's a metered connection.

### Proposal

I would propose a breaking change. Instead of returning an enum, return an object similar to this:

```dart
class ConnectivityResult {
final ConnectivityType type; // An enum with the current enum values except vpn
final bool vpnConnection;
}

```

This allows actually checking the connectivity type when using a VPN. Currently there is no way to do that, at least on Android. On iOS since the VPN information is not exposed the flag could be false.