[10.0] Add ability to ignore cashier routes

[amranidev]

Why?

It would be better to ignore cashier routes if we want and use our own instead.

[driesvints]

But you can overwrite the routes in your web.php file. So not sure why you'd want to ignore the default ones?

[amranidev]

@driesvints We don't want cashier service provider to register any routes, we use custom endpoints and behaviours (we don't use web.php), and it will keep our api docs nice and clean for us.