Add benchmarks as a subproject; publish MetroHash results

[leventov]

Add JMH benchmarks as a subproject in this repository. Evaluate MetroHash performance and add the results to the table in README: https://github.com/OpenHFT/Zero-Allocation-Hashing#performance

[leventov]

Also wyhash

[tgd]

Closing this out as no work is planned on this at the moment. Please comment on this issue if you would like it re-opened. If you would like to expedite the development of this please get in touch with us here for commercial support: https://chronicle.software/contact-us/

[Azmisov]

Yes, would like to see benchmarks, since wyhash is one of the fastest in smhasher tests, but wasn't benchmarked for the README. The results in the README don't align with the smhasher C++ results exactly, e.g. Murmur3 you'd expect to be first or second fastest; so I think benchmarks specifically for this Java implementation would be useful for people to see and pick one.