Zend Data Cache: Add native support for addItem

[marc-mabe]

This should be possible by the zend_[shm|disk]_cache_add functions.

Needs to find out at which version these functions are available and if we have to test against it.

[weierophinney]

This repository has been closed and moved to laminas/laminas-cache; a new issue has been opened at laminas/laminas-cache#10.