* Replace monitoring solution with kube-prometheus-stack dependency
* Enable pod monitors
* Download necessary chart dependencies for CI
* Actually run dependency update
* Enable missed podMonitor
* Disable alertmanager by default for feature parity
Related issues #294#65
Supersedes #296 and #297
### Motivation
Our helm chart is out of date. I propose we make a breaking change for the monitoring solution and start using the `kube-prometheus-stack` as a dependency. This should make upgrades easier and will let users leverage all of that chart's features.
This change will result in the removal of the StreamNative Grafana Dashboards. We'll need to figure out the right way to address that. The apache/pulsar project has grafana dashboards, but they have not been maintained. With this added dependency, we'll have the benefit of being able to use k8s `ConfigMap`s to configure grafana dashboards.
### Modifications
* Remove old prometheus and grafana configuration
* Add kube-prometheus-stack chart as a dependency
* Enable several components by default. I am not opinionated on these, but it is based on the other values in the chart.
### Verifying this change
This is a large change that will require manual validation, and may break deployments. I propose this triggers a helm chart 3.0.0 release.
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