Add purge everything queuer plugin and service which can be used to queue everything invalidation

* Provide a purge queuer named Everything queuer which allows queuing of everything invalidation.

* Provide a Drupal service named `purge_everything_queuer.everything` which can
be used to queue everything invalidation. When used by default it clears all
existing items in the queue.

* Usage example:

 \Drupal::service('purge_everything_queuer.everything')->queueEverything();