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/theodolite/crd-execution.yaml

@@ -60,6 +60,9 @@ spec:
                     prometheusUrl:
                       description: Connection string for Promehteus.
                       type: string
+                    query:
+                      description: The prometheus query string
+                      type: string
                     offset:
                       description: Hours by which the start and end timestamp will be shifted (for different timezones).
                       type: integer