Add unordered case for TransitionChoice + use bins

[jrapin]

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context / Related issue

How Has This Been Tested (if it applies)

Checklist

• [x] The documentation is up-to-date with the changes I made.
• [x] I have read the CONTRIBUTING document and completed the CLA (see CLA).
• [x] All tests passed, and additional code has been covered with new tests.

[teytaud]

I think that in pbo_suite we need three cases:

• "Softmax" which leads to the logit stuff as we know it.
• "Unordered" which leads to TransitionChoice and ordered=False
• "Ordered" which leads to TransitionChoice and ordered=True so that results will be very cool.

It's: (i) adding something like: << elif instrumentation == "Unordered": parameterization = ng.p.TransitionChoice([0, 1], repetitions=dim, ordered=False)

in https://github.com/facebookresearch/nevergrad/blob/21ac3f4570127a9946cdb45e60c0245a3dddec35/nevergrad/functions/iohprofiler/core.py#L57 and (ii) adding "Ordered" in https://github.com/facebookresearch/nevergrad/blob/21ac3f4570127a9946cdb45e60c0245a3dddec35/nevergrad/functions/iohprofiler/core.py#L52 and (iii) adding "Ordered" in https://github.com/facebookresearch/nevergrad/blob/21ac3f4570127a9946cdb45e60c0245a3dddec35/nevergrad/benchmark/experiments.py#L1928

and the result of this experiment will be very interesting (I can run that if you wish, I do this kind of run everyday :-) ).