Add authorization to views, widgets and filters

[milewski]

Example usage:

NovaDashboard::make()
    ->addView('Main', fn (View $view) => $view
        ->canSee(fn () => false) // On the view
        ->addWidgets([
            BounceRate::make()->canSee(fn () => false), // On a widget
        ])
        ->addFilters([
            UserType::make()->canSee(fn () => false), // On a filter
        ]),
    ),