performance test: create script that execute load testing of GET endpoints

[mobuchowski]

Given database with (large) amount of lineage events and Marquez API, design script based on https://k6.io/ that executes GET requests on the endpoints, particularly those that are used by the UI.

The script should be flexible on to where the API and database is; it could be docker running on same machine, or instance running somewhere else.

[wslulciuc]

Thanks for kicking this off, @mobuchowski. I also wanted to link #2047 and Load Testing with k6 as a reference!