Add vendor:publish support

[aldesrahim]

It enables configuration files and other publishable assets from external composer dependencies to be published directly into a specific module.

This makes it easier to configure third-party packages used by individual modules without affecting the global application scope.

Example
When installing lucasdotvin/laravel-soulbscription, we might want to publish its migration and configuration files inside the Billing module.

php artisan vendor:publish --tag=soulbscription-config
php artisan vendor:publish --tag=soulbscription-migrations

However, the published configuration file is not automatically loaded.
To load it, we can manually merge the configuration in BillingServiceProvider:

public function register(): void
{
    $this->mergeConfigFrom(
         __DIR__ . '/../../config/soulbscription.php',
         'soulbscription'
    );
}

This change simplifies that workflow by integrating vendor:publish behavior directly with the module system.