[Searchable Snapshot] Add first class support to test performance for searchable snapshot in opensearch-benchmark

[tlfeng]

Is your feature request related to a problem? Please describe.
In issue #4797 (comment), I proposed a brief plan for adding first-class support to run performance test for Searchable Snapshot in opensearch-benchmark. New workload is needed to add to the repository of https://github.com/opensearch-project/opensearch-benchmark-workloads

Related to #3983

Describe the solution you'd like
See the plan mentioned above: #4797 (comment)

Describe alternatives you've considered
n/a

Additional context
n/a

[tlfeng]

The issue can be resolved by PR opensearch-project/opensearch-benchmark-workloads#58

[tlfeng]

Closed the issue, because the PR has been merged opensearch-project/opensearch-benchmark-workloads#58 on Mar.17th, 2023. A test procedure of using Searchable Snapshots feature has been added.