Introduce dynamic return type for the `get_approved_comments` function

[lipemat]

get_approved_comments changes the return type based on value within the passed $args parameter.

• Return 'WP_Comment[]' by default.
• Return int[] if $fields = 'ids'.
• Return int if $count = true.

https://developer.wordpress.org/reference/functions/get_approved_comments/#return

[szepeviktor]

Thank you.