Feature: investigate integratine k6 performance testing

[jpmcb]

Would it be worth benchmarking some queries to track this?

Yes. This is what we'd want to use Grafana K6 for: performance testing of our RESTful API endpoints https://k6.io/docs/examples/tutorials/get-started-with-k6/test-for-performance/

Originally posted by @jpmcb in #708 (comment)

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K6s gives us the ability to do perform load testing to track API performance and reliability. This is especially pertinent for this API since different scenario, like the range of days in a query, may perform differently.