Add support for wp_cache_get_multiple to Object Cache

[jacobd91]

WP 6.0 added this method to support Redis and Memcached and allow for the fetching of multiple objects in a single request

[mavas84]

As per Jonathan Harris member of the WordPress core performance team
Most important is wp_cache_get_multiple. I wrote an article about the importance of this function how massive impact performance. https://xwp.co/easy-performance-wins-with-opt-in-caching-improvements/

https://make.wordpress.org/core/2020/08/11/introduce-wp_cache_get_multiple/
https://make.wordpress.org/core/2022/04/29/caching-improvements-in-wordpress-6-0/
https://make.wordpress.org/core/2022/10/11/performance-field-guide-for-wordpress-6-1/

[mavas84]

Examples of where this was implemented

pantheon-systems/wp-redis@d5a57e3
Automattic/wp-memcached#88
WordPress/wordpress-develop@ab0feb8