Adding some benchmarks

[osunderdog]

Propose adding benchmark code along with a similar test.
Some example benchmarks for ping-pong, load balancer and storage.
Tests are use to confirm that the benchmark is testing something real.

to run use:

cargo bench

Example metrics from benchmark runs

test test_loadbalancer::loadbalancer_bench ... bench:         583.14 ns/iter (+/- 5.70)
test test_models::storage_bench ... bench:                    166.18 ns/iter (+/- 3.14)    
test testy::ping_pong_bench ... bench:                      2,321.04 ns/iter (+/- 22.68)

work alias: ParensAllTheWayDown

[osunderdog]

Minimal change check