Extend Compare Subcommand Capabilities

[IanHoang]

Is your feature request related to a problem? Please describe.
At the moment, compare subcommand compares two different test executions and displays the differences to the user. We can extend this feature to support aggregating the results across a series of tests and even converting them into a CSV format.

Describe the solution you'd like
We could utilize scripts similar to what's seen in these two scripts

• https://github.com/IanHoang/opensearch-scripts/blob/main/osb-scripts/average-test-execution-results-v2.py
• https://github.com/IanHoang/opensearch-scripts/blob/main/osb-scripts/convert-results-to-csv.py