feat: add support for processing scheduled instructor tasks

[MICROBA-1507]

* adds new functionality for retrieving and submitting scheduled tasks to Celery
* add an InstructorTaskSchedule factory for unit testing
* adds unit tests for processing scheduled tasks

lms/djangoapps/instructor_task/data.py

@@ -0,0 +1,34 @@
+"""
+Public data structures for the instructor_task app.
+"""
+from enum import Enum
+
+
+class InstructorTaskTypes(str, Enum):
+    """
+    Enum describing the assortment of instructor tasks supported by edx-platform.
+    """
+    BULK_COURSE_EMAIL = "bulk_course_email"
+    COHORT_STUDENTS = "cohort_students"
+    COURSE_SURVEY_REPORT = "course_survey_report"
+    DELETE_PROBLEM_STATE = "delete_problem_state"
+    DETAILED_ENROLLMENT_REPORT = "detailed_enrollment_report"
+    EXEC_SUMMARY_REPORT = "exec_summary_report"
+    EXPORT_ORA2_DATA = "export_ora2_data"
+    EXPORT_ORA2_SUBMISSION_FILES = "export_ora2_submission_files"
+    EXPORT_ORA2_SUMMARY = "export_ora2_summary"
+    GENERATE_ANONYMOUS_IDS_FOR_COURSE = "generate_anonymous_ids_for_course"
+    GENERATE_CERTIFICATES_ALL_STUDENT = "generate_certificates_all_student"
+    GENERATE_CERTIFICATES_CERTAIN_STUDENT = "generate_certificates_certain_student"
+    GENERATE_CERTIFICATES_STUDENT_SET = "generate_certificates_student_set"
+    GRADE_COURSE = "grade_course"
+    GRADE_PROBLEMS = "grade_problems"
+    MAY_ENROLL_INFO_CSV = "may_enroll_info_csv"
+    OVERRIDE_PROBLEM_SCORE = "override_problem_score"
+    PROBLEM_RESPONSES_CSV = "problem_responses_csv"
+    PROCTORED_EXAM_RESULTS_REPORT = "proctored_exam_results_report"
+    PROFILE_INFO_CSV = "profile_info_csv"
+    REGENERATE_CERTIFICATES_ALL_STUDENT = "regenerate_certificates_all_student"
+    RESCORE_PROBLEM = "rescore_problem"
+    RESCORE_PROBLEM_IF_HIGHER = "rescore_problem_if_higher"
+    RESET_PROBLEM_ATTEMPTS = "reset_problem_attempts"