[11.x] Added conditionals to routes.

[Boorinio]

This pull request introduces the Conditionable trait to the Laravel Route class, allowing developers to add conditional logic when defining routes. Consider the following:

Route::middleware('shop')
    ->domain('{shop}.domain.com')
    ->when(App::isProduction(), function ($route) {
        $route->whereIn('shop', app(ShopService::class)->getShopSlugs());   
    });

No Breaking Changes

This addition does not alter any existing functionality of the Route class. The Conditionable trait is introduced as an optional feature that will only be applied when explicitly used by developers. Existing routes will continue to work as expected without any modifications.

P.S. tests included.

Thanks for your time

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!