Lazy loading the controllers

[mitelg]

Currently, while starting Shopware, all Controllers are initialized, which is not necessary at all, and then cloned to reduce the shared state. shopware/engine/Library/Enlight/Controller/Dispatcher/Default.php

We should exchange this with a service locator, which only initializes the controller needed.
Moreover, we should remove the clone and reduce the state in the controllers.

This should reduce the request time and memory since fewer services are created upfront.