add prometheus integration for Flink operator #44
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In #19, I added the Prometheus integration for job managers/task managers. But I missed the Flink kubernetes operator. Added it in this PR.
For the openshift podMonitor/serviceMonitor, please refer to: https://docs.openshift.com/container-platform/4.16/observability/monitoring/managing-metrics.html#setting-up-metrics-collection-for-user-defined-projects_managing-metrics