Add GitHub action that assigns reviewers when equivalent class axioms are updated

[matentzn]

The main use case for this action is to provide a way to assign specific reviewers when equivalent class axioms are added or updated, but it should be easy to extend the action to other kinds of edits, hence the generic name.

To achieve the above, we check the diff for changes to rows that signify a logical definition, i.e. starting with "intersection_of". If we find such a change, we set a special environment variable to "true"; if it is "true", in the next step, a reviewer is assigned. Lastly, we let the GitHub action itself make a review, which requests changes - the idea is that these need to be dismissed by a person which sufficient access to Uberon before the change is committed to the main (master) branch.

Issue: #2020

[gouttegd]

I approve on a technical basis. The PR implements the behaviour you and I agreed upon when discussing the original issue.

But as to whether the behaviour is the one we actually want for Uberon, it’s up to Uberon “senior editors“ and especially @cmungall (who opened #2020) to say.

[matentzn]

Thanks! If you see an opening in a Uberon call maybe ask there as well, I will try to catch Chris attention

[cmungall]

LGTM. I cannot promise to monitor and respond in a timely fashion to these review requests, but having me be assigned is still a useful signal, and if people do not mind prodding me e.g. on slack I think this is a good workflow.