Added ShareConsumeBenchSpec and ShareConsumeBenchWorker similar to ConsumeBenchSpec/ConsumeBenchWorker. This will help us run trogdor workloads for share consumers as well.
Added a sample json workload running 5 share consumers.
Reviewers: Andrew Schofield <aschofield@confluent.io>, Manikumar Reddy <manikumar.reddy@gmail.com>
ShivsundarR