mediawikI: Add a way to view opcache/apcu stats

[paladox]

This is from wikimedias puppet repo [0] with minor tweeks to conform to how we do things.

[0] https://github.com/wikimedia/operations-puppet/blob/bd7cbb36d87e147da028c3c51b583f93f5851957/modules/profile/manifests/mediawiki/php/monitoring.pp

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