Trac #65313: Extend WP_Comment_Query 'fields' to support individual c…

[Anupkankale]

…olumn names

• Accepts a single valid column name (e.g. 'comment_post_ID') and returns a flat array of scalar values
• Accepts an array of valid column names and returns stdClass objects per row
• Invalid column names fall back to full WP_Comment objects
• Existing 'ids' and '' (default) behaviour unchanged
• Follows the same pattern as WP_User_Query

Fixes https://core.trac.wordpress.org/ticket/65313

Trac ticket:

Use of AI Tools

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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[westonruter]

Thanks for the PR, but I'm closing in favor of #11934 since it lacks coding standards issues while also including unit tests. If you have any suggestions for that PR, please add them there.