Support Laravel Broadcast scope binding

[Barbapapazes]

Hello,

The router supports the scope binding to make sure that a parameter is the child of another one. Actually, broadcast does not support it but it could be very useful to support it to have a better feature parity between the router and the broadcasting channel definition.

https://laravel.com/docs/11.x/routing#implicit-model-binding-scoping

[Barbapapazes]

Actually, you can define

/**
 * Get the route key for the model.
 */
public function getRouteKeyName(): string
{
    return 'number';
}

in a model and it will be used by the Broadcast::channel method but not the scope binding which is a real issue.