Serializer for checklist item links.

Represents the connection between checklist items and folders. Fields: id (str): The unique identifier of the checklist item link (read-only) folder_id (str): The unique identifier of the linked folder (write-only) folder (str): The unique identifier of the linked folder (read-only) folder_name (str): The name of the linked folder (read-only) checklist_item_id (str): The hashid of the checklist item (write-only) checklist_item (str): The hashid of the checklist item (read-only) created_at (datetime): When the link was created (read-only)