[Request]: [connectivity_plus] Get network state regardless of internet connection

### Plugin

connectivity_plus

### Use case

I would like to check, whether Wi-Fi is turned on or off. I don't care, if there is an internet connection available or not. Same for mobile data.

Currently when I have Wi-Fi enabled but it's not connected to any network, I get `ConnectivityResult.none`.

### Proposal

I'd expect the `Connectivity::checkConnectivity()` method to return which hardware features (Wi-Fi, mobile data) are turned on and not through which hardware the internet connection is established.

Maybe another method would suite that use case better like
```
Future> getConnectivityHardwareStates()
```

Comienza leyendo el plugin connectivity_plus y la API existente Connectivity::checkConnectivity() descrita en el issue. Compara el comportamiento actual de ConnectivityResult.none con la API de estado del hardware propuesta en las plataformas compatibles. Se considera terminado cuando los estados previstos de Wi-Fi y datos móviles estén claramente definidos y expuestos sin depender de la conectividad a Internet.

Escrito por el modelo de indexación a partir del texto del issue.