Make the analysis of experiments more flexible

• Allow arbitrary prometheus range queres (update prometheusResponse)
• Allow usage of more than one slo checker
• Update the json which send to the python slo checker
• refactoring
• Update CRDs in order to set the query string as an dedicated parameter for a slo checker
• Update exisiting python slo checker in order to use the new JSON format (handled in !185 (merged))

Closes #249 (closed)

helm/templates/grafana/dashboard-config-map.yaml

@@ -24,7 +24,7 @@ data:
     "editable": true,
     "gnetId": null,
     "graphTooltip": 0,
-    "id": 2,
+    "id": 1,
     "iteration": 1589140028684,
     "links": [],
     "panels": [
@@ -1004,4 +1004,4 @@ data:
     "uid": "dad0CNlZz",
     "version": 25
     }`}}
-{{- end }}
\ No newline at end of file
+{{- end }}