Do we still need `Tools/{io,cc,string}bench`?

I would have commented sooner had I known that this was about to happen. It would have been helpful if someone had commented in my PR to ccbench.py that this was being considered so that I would have been notified and might have had a chance to comment before it happened.

I believe it was clear from the extensive discussion about the shortcomings of the current GIL in faster-cpython that the ccbench script is still useful - because it clearly identifies an ongoing performance issue when multithreading with one or more CPU-heavy threads.

That said, I do understand that performance scripts do not really have a place in the cpython source code repo, but unfortunately I do not have the time to rework the updated ccbench script for the pyperformance suite, so I guess it is going to just disappear.