Isaac Seymour

- first separate the Exporter from the ExporterRun, so that we can only instantiate the Exporter once, and then instantiate a fresh ExporterRun on each scrape (which has the http...

In the [create incident API](https://docs.opsgenie.com/docs/incident-api#create-incident) there's the option to pass `{ "type": "user", "username": "[email protected]" }`, but this SDK can't serialize a username into that payload