Optimize _build_feedback_options_cells

[Stoorx]

TL;DR - The function have been rewrited to perform exactly one query. Also, the join function was used to avoid string copying.

What changed?

• x200 speed up
• The last line delimiter is absent now. (Do not know whether it is important)

Developer Checklist

• Reviewed the release process
• Bumped version number in openassessment/__init__.py and package.json

Testing Instructions

Unit test should pass, since the behaviour is the same.

Benchmarking

assessments = Assessment.objects.all()[:1000]
timeit('old(assessments)', globals=locals(), number=10) * 100
# 1029.1335321962833  # milliseconds
timeit('new(assessments)', globals=locals(), number=10) * 100
# 6.815670058131218 # milliseconds

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• I've done a visual code review
• I've tested the new functionality

FYI: @openedx/content-aurora

[openedx-webhooks]

Thanks for the pull request, @Stoorx!

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[itsjeyd]

Hey @Stoorx, thank you for this contribution!

As the bot says, you'll need to submit a signed CLA before we can process this PR any further. Once that's done we'll kick off a test build for you.