Changes to POST `/api/v0/course-material/exercises/:exercise_id/submissions` - Post new submission for an exercise. # Example ```http POST /api/v0/course-material/exercises/:exercise_id/submissions HTTP/1.1 Content-Type: application/json { "exercise_slide_id": "0125c21b-6afa-4652-89f7-56c48bd8ffe4", "exercise_task_answers": [ { "exercise_task_id": "0125c21b-6afa-4652-89f7-56c48bd8ffe4", "answer": { "kind": "json", "data": { "selectedOptionId": "8f09e9a0-ac20-486a-ba29-704e7eeaf6af" } } } ] } ```

added the new optional request property exercise_task_submissions/items/answer_kind

added the new optional request property exercise_task_submissions/items/data_files

the request property exercise_task_submissions/items/data_json became optional

added the optional property exercise_task_submission_results/items/submission/data_files to the response with the 200 status

added the required property exercise_task_submission_results/items/submission/answer_kind to the response with the 200 status

added the new NotAnsweredAndLocked enum value to the exercise_status/oneOf[#/components/schemas/ExerciseStatus]/reviewing_stage response property for the response status 200