Multi threaded eval with http endpoint

[mpetri]

Real production systems need to be evaluated at say 1000 TPS. just running sequential queries especially with a method such as impact ordered indexes which eat up memory bandwidth is not realistic.

With rust it is very easy to set up a highly concurrent http endpoint that we can use to measure performance in a "real world" setting which might show very different performance characteristics compared to sequential retrieval.

[JMMackenzie]

Done!