[utils/task-tester] Add task tester

[nrybowski]

Add the task tester feature. It allows replaying old submissions to ensure that tasks are still valid / functional e.g. after a modification of a task or the update of its environment.

This PR also contains a submission anonymizer. This is a script removing all the fields allowing the identification of the original submission author.

See https://github.com/UCL-INGI/.github/pull/1 for automated deployement in GitHub actions.

Steps

Task tester

• [x] Replay submissions
  • [x] From a single task
  • [x] From a subset of the course's tasks
  • [x] From all the course's tasks
• [x] Load additional task types from plugins
• [ ] Improve logs
• [ ] Compare stdout and stderr outputs and propose improvements to the task developers without making the tests fail
• [ ] Add thread pool to parallelize tasks and jobs rerun

Submissions anonymizer

• [x] Anonymize a set of submission files from a .tar.gz archive
• [x] Put the anonymized submissions directly in the course directory
• [ ] Add tests
• [ ] Fix paths for windows
• [ ] Handle case of single submission in the archive

[nrybowski]

As the remaining tasks in this PR are mainly improvements and do not impact the functionnal requirement of this feature, I mark it as ready for review. Those future improvements will be added in their own feature requests.

[nrybowski]

The logs refactor should still be done before merging the tools. This PR goes back in the draft state until it is done.

[nrybowski]

Rebased on https://github.com/UCL-INGI/INGInious/commit/0959be6d8127e5a867a3e190423897069bf2eae9.

Tested on https://github.com/UCL-INGI/INGInious/pull/866/commits/9b1bf3c62d82b243e10ab006112b3a039a35eda8.

The PR is ready for merge.