Add benchmark tools

[hitomitak]

Summary

I added the benchmark tools in test/performance/simulate directory.
This benchmark can simulate qiskit, ProjectQ, and Q# with the same qasm scenario or qiskit code.

Details and comments

The detailed description is available as following README.md file.
https://github.com/hitomitak/qiskit-core/tree/benchmark/test/performance/simulate/benchmarks

[ajavadia]

@hitomitak thanks for updating this PR.
can you please add a one-line description of what you have done to the CHANGELOG, so we can keep track of updates for the new release?

[hitomitak]

@ajavadia Thank for comments. I added the description to CHANGELOG and fixed some pylint errors.

[delapuente]

I love the idea but I would move this to a separated repository since it does not relate directly to Qiskit.

[jaygambetta]

@diego-plan9 can we put this on hold and come back to it after 0.6

[diego-plan9]

Yes, makes a lot of sense 👍

[atilag]

Thanks @hitomitak !
I do think that these kind of tests, now belong to Aer, so I'd suggest to close this issue and move the discussion to the Aer repository.