CkCommentContentBuilder<T> typedef
CkCommentContentBuilder<T> =
Widget Function(BuildContext context, T item, int depth)
Builds everything for item except the avatar, reaction row and reply
action (those are separate builders below) — typically the name/header
row, the comment text and any attached media.
Implementation
typedef CkCommentContentBuilder<T> =
Widget Function(BuildContext context, T item, int depth);