Benchmarks: Port core functionality of benchmark runner into client project

[vprusso]

It seems to me that it makes the most logical sense to put the functionality of running the benchmarks into the client project (let me know if you disagree, @WrathfulSpatula).

At present, the base-level functionality for running the benchmarking pipeline is located here:
https://github.com/unitaryfund/metriq-api/blob/main/benchmark/run.py

We should create a folder in the root directory with the name benchmark/ with the contents of run.py contained within as a first step. We should also ensure that the benchmarking pipeline is able to be run as well.

@srilakshmip03 / @QuantumAli I think focusing work on the benchmarks would take priority for the client, so it probably makes sense to sync on this for further details.