Add listener/receiver for payloads with Prometheus/Loki support

[jtommi]

I created a Postman collection with a lot of test for my own listener, some of them will probably help you. The requests don't contain the whole body, though, just what I considered essential. It also generates random UUIDs, name, current timestamps, etc https://github.com/jtommi/analytics-panel-listener/blob/main/Analytics%20panel%20listener.postman_collection.json If you're not familiar with the collection runner: https://learning.postman.com/docs/running-collections/intro-to-collection-runs/

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