Helm deployment of Redpanda/Prometheus/Grafana

Many Kubernetes deployments are automated via terraform, and our users have requested that we provide scripts to help with deploying Redpanda in this way. An example of deploying Redpanda into k8s via terraform is https://github.com/vuldin/tf-redpanda-k8s

Internal slack thread discussing this feature: https://redpandadata.slack.com/archives/C049AE7V4U8/p1693935677859739

