Retrieve attachments for a specific parent table and ID.Args: parent_table (str): The name of the parent table (e.g., 'orders', 'products') parent_id (int): The ID of the parent record skip (int): Number of records to skip for pagination limit (int): Maximum number of records to return db (Session): The database session current_user (schemas.User): The user requesting the attachmentsReturns: List[schemas.Attachment]: A list of attachments associated with the parent record