Get Lemon8 comments list of a post

Returns Lemon8 comments list of specified post. Send item_id (Post's item_id), group_id (Post's group_id), media_id (Post's media_id); optional offset. offset: Pagination parameter, can be obtained from the return result of the last request. It is empty for the first request, and the offset returned by the last request is used for subsequent requests. group_id: Post's group_id, can be obtained from the endpoint /lemon8/app/fetch_post_detail.