Add _health endpoint #71
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This adds a basic healthcheck endpoint at /_health. At the moment, it only shows that the server is up and running and handling requests. I think this is okay, though, as the event service has more detailed metrics, and existing alerts from these, to give a more detailed look at the application's health. This endpoint can be used as a simple uptime alert to check the status of the service itself.
I tried to follow the pattern of the existing code, and so wrapped the check as a json response using boreq's rest library.