Add API for querying Prometheus "directly" #571
Merged
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The PrometheusService supports Query and QueryRange queries.
The requests are still proxied through the API component, yet, the queries aren't constructed and run by the API component anymore, but sent as strings from the API to the UI and then queried from the UI through the API directly to Prometheus.
This allows the UI to run arbitrary queries in the futures. Needed for even more interactive use cases.