Course attachment endpoints

Method	Endpoint	Description
POST	/v1/course-attachments	Create a course attachment
GET	/v1/course-attachments/:id	Fetch a single course attachment
PATCH	/v1/course-attachments/:id	Partially updates a course attachment
DELETE	/v1/course-attachments/:id	Permanently delete a course attachment
GET	/v1/course-attachments	Fetch a list of course attachments