feat: Add simple ycsb-c-esque benchmark limit test

[jwuensche]

This PR adds a simple IOPS test with the default YCSB-C configuration (Zipfian Distribution with theta 0.99 and 1 KB entries).

This benchmark does:

• multi-threaded read requests via key-value interface
• fetch the maximum number of IOPS reached for 1..n workers

This benchmark does not:

• split the 1KB into 10x100B members and access them separately
• rate limit requests to ascertain latencies
• gather latencies and tail latencies for a complete view of the request performance

This case was primarily added to compare between versions of Haura to estimate point query performance.

[jwuensche]

Also adds this helpful graph: