[META] Cluster Redline testing using OpenSearch Benchmark

[rishabh6788]

Meta issue to track all the work that is being done to enhance opensearch-benchmark and leverage it for doing stress and redline testing on OpenSearch clusters.

RFC and Proposals

#731
#729

Issues

• Support gradual ramp up of clients #713 - Add support for gradual client ramp up.
• Add Dynamic Client Ramp up to OSB #736 - Ramp up benchmark clients dynamically
• Add feedback mechanism to predict max throughput of the OpenSearch cluster #742 - Add feedback mechanism to predict max throughput of the OpenSearch cluster.