Creates a new assignment group in a specific course using the Canvas LMS API.
create_assignment_group(canvas, course_id, group_name, group_position = NULL)A confirmation message that the assignment group has been created.
A list containing the 'api_key' and 'base_url' for authentication.
The ID of the course in which to create the assignment group.
The name of the assignment group.
The position of the assignment group in the course (optional).