Build a service layer around OpenSearch Benchmark

[achitojha]

Create a service layer around OpenSearch Benchmark. This will allow users to run OpenSearch Benchmark as a service which could enable to run performance tests with just an API call for various scenarios. This will allow developers to setup OpenSearch Benchmark as a service and not have every user worry about setting up infrastructure to run performance tests. Alongside the service endpoint users should also be able to execute performance tests with OpenSearch Benchmark using command line cli.

[dblock]

As we do this, I'd like to ensure that a service is not required to execute performance tests. I want to be able to run an instance of OpenSearch Benchmark Service locally for development purposes.