load tests POC

[zven]

As part of the public RC phase, we want to run some load tests on staging.opensensemap.org to see how OSEM fares with under higher loads. This could include the following use cases:

• XX (50?) devices send data at the same time
• XX devices are created simultaneously

We should dig into k6 for running the tests: https://github.com/grafana/k6

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Todos for first try:

• set up k6
• create 10 boxes by hand
• experiment with feeding random measurements into those 10 boxes at a high rate