Implement lazy loading comment meta in WP_Comment_Query

[spacedmonkey]

When using WP_Comment_Query class, comment meta should be lazily loaded, as comment meta is not required for most page loads. Comment meta can easily be lazily load using existing apis found in core in the WP_Metadata_Lazyloader class.

Related to #57645 #57496

Trac ticket: https://core.trac.wordpress.org/ticket/57801

[spacedmonkey]

Before

[spacedmonkey]

After

Awaiting review from @peterwilsoncc or @mukeshpanchal27

[spacedmonkey]

In 55749:

Comments: Always lazily load comment meta.

In [34270] introduced lazy loading of comment meta. However, this was only in the context of WP_Query. Other parts of the codebase, like WP_Comment_Query did not lazily load comment meta. In this change, calls to update_meta_cache are now replaced with wp_lazyload_comment_meta, that instead of priming comment meta caches, just adds them to the queue to be primed it ever called. This results in far less database queries, as there a number of places where comment meta is being primed unnecessarily and never used. Adding everything to the comment meta queue, also means that if comment meta is used, that is all loaded in a single database / cache call.

Follow on from [55671], [55747].

Props spacedmonkey, peterwilsoncc, flixos90, mukesh27.
Fixes #57801.

Committed. ​https://github.com/WordPress/wordpress-develop/commit/3114eda235d6740f82fc9f2b4bdf0735e43560ed

[spacedmonkey]

@flixos90 @peterwilsoncc Create a ticket to deprecate wp_queue_comments_for_comment_meta_lazyload function #58301.