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The query cache currently implemented in `WP_Term_Query` caches the final output of the query, depending on what fields are requested. This is wasteful, as if a user requests `fields` => `all`, then an unlimited array of `WP_Term` objects could be stored in the object cache. Instead of storing the whole WP_Term object, this change only the term_id is stored. To get an array the full WP_Term objects, the `_prime_term_caches` function is called with an array of ids. In instances where a persistent object cache is not in use, then this will result in another SQL query to be run. After `_prime_term_caches` is called if this term is requested again in the same page load, then it will already be loaded into memory. If a user runs `WP_Term_Query` with the fields param set to `all_with_object_id`, an array of objects containing both the term_id and object_ids are stored in cache. This change also improves the logic to load term meta caches. This change ensures that term meta is always primed for all terms loaded in the term query. Props Spacedmonkey, boonebgorges, jbpaul17, peterwilsoncc, flixos90, pbearne. Fixes #37189. git-svn-id: https://develop.svn.wordpress.org/trunk@52836 602fd350-edb4-49c9-b593-d223f7449a82