Add support for long-running infrastructure components

This MR introduces a field called "Infrastructure" in the benchmark specification. This allows specifying Kubernetes resources that are deployed/removed before/after the whole execution.

Closes #272 (closed)

helm/templates/theodolite/random-scheduler/deployment.yaml

@@ -27,4 +27,8 @@ spec:
           env:
             - name: TARGET_NAMESPACE
               value: {{ .Release.Namespace }}
+      {{- with .Values.randomScheduler.nodeSelector }}
+      nodeSelector:
+      {{ toYaml . | indent 2 }}
+      {{- end }}
 {{- end }}