Course task completion endpoints

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