Guest commenting

'core' => [
    'allow_guests' => true,
    'guest' => [
        'require_email' => true,
        'show_gravatar' => true,
    ],
],

{
  "body": "Used chives instead of scallions.",
  "guest_name": "Alex Kim",
  "guest_email": "alex@example.com"
}

'guests' => [
    'stricter_spam' => true,
],

$comment->isGuest();
$comment->authorName();
$comment->authorEmail();
$comment->authorAvatar();