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Cache the results of database queries within `WP_User_Query` class. Only cache queries that are requesting 3 or less fields so that caches are not storing full user objects. Cache results are stored in a new global cache group named `users-queries`. Add a new parameter to `WP_User_Query` called `cache_results` to allow developers to opt out of a receiving cached results. `cache_results` parameter defaults to true. Also add a new helper function called `wp_cache_set_users_last_changed`, similar to `wp_cache_set_posts_last_changed` that incroments last changed value in cache group `users`. Ensure that `wp_cache_set_users_last_changed` is called whenever user / user meta is modified for proper cache invalidation. Props johnjamesjacoby, spacedmonkey, westi, dd32, strategio, srikanthmeenakshi, OllieJones, khoipro, rjasdfiii, flixos90, mukesh27, peterwilsoncc. Fixes #40613. Built from https://develop.svn.wordpress.org/trunk@55657 git-svn-id: http://core.svn.wordpress.org/trunk@55169 1a063a9b-81f0-0310-95a4-ce76da25c4cd