Fix EZP-21321: Extend ezpublish/console cache:clear

https://jira.ez.no/browse/EZP-21321

Adds the following tasks to `cache:clear` command:
* Clears Http cache (particularly useful when using an external reverse proxy)
* Clears legacy cache (equivalent to `php bin/php/ezcache.php --clear-all`
* Clears persistence cache