feat: add Policies as optional command

[caiodomingues]

It would be of great value to add a flag to generate the Policy of the model, we can manage permissions in a simplistic way using resource validations. We wouldn't need to really create the Policy file, since the one provided by Laravel CLI when passing the --model=Dummy flag is enough.

Meanwhile, we could change the Controller constructor function to inject the resource authorization:

use App\Models\Dummy;

class DummyController extends Controller {

public function __construct() {
     // ...
     $this->authorizeResource(Dummy::class);
}

The validation option can also be automatically added to the constructor if the flag is used.