Ability to scale and ramp up throughput with OSB

[IanHoang]

Is your feature request related to a problem? Please describe. To better simulate customer experiences, OSB should include a mechanism that scales up throughput during a test.

Describe the solution you'd like OSB should incorporate a feature that autoscales the number of clients to produce more throughput.

Describe alternatives you've considered

Additional context

[AkshathRaghav]

@IanHoang I have a question about this. Is this meant to help during execution or creation of a workload? Does #403 help in this?

[IanHoang]

This is more for execution of the workload. This is separate from #403

[wbeckler]

Some ideas for how to scale the client in order to do load testing are here: https://github.com/opensearch-project/opensearch-clients/issues/27