[DRAFT] ci: add reviewers workflow

[mr-cal]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run tox run -m lint?
• Have you successfully run tox run -e test-py310? (supported versions: py39, py310, py311, py312)

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still under development

Adds the following logic:

• When starcraft-reviewers is added to a pull request, add the needs-starcraft-review label
• When a review is submitted, re-add the starcraft-reviewers team if the PR has needs-starcraft-review and has less than 2 reviews

This may not work if someone outside the starcraft-reviewers team approves the PR. In this case, someone would have to manually re-request starcraft-reviewers again.

[mr-cal]

test

[mr-cal]

Fun experiment but too much hackery to workaround this github limitation: https://github.com/orgs/community/discussions/5289