The new 'update_comment_meta_cache' parameter, which defaults to `true`, can
be used to disable this behavior.
`update_comment_cache()` has been updated to support an `$update_meta_cache`
parameter, which also updates to true; this matches the pattern we use for
priming post caches.
See #16894.
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* Takes inspiration from `WP_Post` and adds sanity to comment caching.
* Clarifies when the current global value for `$comment` is returned. The current implementation in `get_comment()` introduces side effects and an occasion stale global value for `$comment` when comment caches are cleaned.
* Strongly-types `@param` docs
* This class is marked `final` for now
Props wonderboymusic, nacin.
See #32619.
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