Epic: Helm alternative to start_all.sh

[tzach]

When running on a K8s environment, standard tools, like Helm should be used.
See for an example of using Helm to run Prometheus and Grafana on K8s
https://medium.com/@chris_linguine/how-to-monitor-your-kubernetes-cluster-with-prometheus-and-grafana-2d5704187fc8

[tzach]

prometheus-operator:
https://github.com/coreos/prometheus-operator/blob/master/Documentation/user-guides/getting-started.md

[tzach]

Using Scylla/ Grafana and Prometheus on k8s
https://github.com/scylladb/scylla-operator/blob/eeb410654f1eb2257abfd6cae37587c4773f8d33/README.md