Implements the /notification/query endpoint on the historian app. Note that it
does not apply any RBAC right now, that will be a follow up commit.
We have to use a go-kit logger in grafana/alerting, so an adapter is needed.
Going from go-kit to slog is a bit hairy but works well enough.
We have two historians in alerting - alert state and notification. The intention
of this app is to provide query capabilities for both.
In this initial commit, the existing /history API is simply cloned to the new
app. It is identical except that it will send Kubernetes-style error responses
instead of Grafana-style.
This approach was taken to implement the new app more iteratively - ideally we
would define a new API, but this requires quite a significant overhaul of the
backend code.
Steve Simpson