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WordPress has recently introduced a variety of caching API improvements: * `wp_cache_add_multiple()` * `wp_cache_set_multiple()` * `wp_cache_get_multiple()` * `wp_cache_delete_multiple()` * `wp_cache_flush_runtime()` * `wp_cache_flush_group()` Although WordPress core provides a compatibility layer if these functions are missing from third-party object cache implementations, there should be a method of checking whether the cache backend supports a particular feature. This commit aims to improve developer experience by allowing third-party object cache plugins to declare a `wp_cache_supports()` function and correctly list their supported features: * `add_multiple` * `set_multiple` * `get_multiple` * `delete_multiple` * `flush_runtime` * `flush_group` Note: The `wp_cache_supports()` function replaces and supersedes the `wp_cache_supports_group_flush()` function added earlier. Follow-up to [47938], [47944], [52700], [52703], [52706], [52708], [53763], [53767], [54423]. Props johnjamesjacoby, tillkruess, spacedmonkey, SergeyBiryukov. Fixes #56605. git-svn-id: https://develop.svn.wordpress.org/trunk@54448 602fd350-edb4-49c9-b593-d223f7449a82