### Motivation
As I wanted to use [streamnative/apache-pulsar-grafana-dashboard](https://github.com/streamnative/apache-pulsar-grafana-dashboard) with this helm chart and own cluster wide Prometheus stack I decided that use of PodMonitor CRD is a good way. Unfortunately prometheus config has some metrics relabelings that are required by grafana dashboard. I decied to port them directly to PodMonitor definition
### Modifications
* Added missing PodMonitor for autorecovery
* Port relabelings from `prometheus-configmap.yaml` to each PodMonitor
### Verifying this change
- [x] Make sure that the change passes the CI checks.
* Add 'http' port specification to zookeeper statefulset
This makes the zookeeper spec inline with the other statefulset specs
in this chart and it provides a port target for custom podMonitors
* Added PodMonitors for bookie, broker, proxy, and zookeeper
New PodMonitors are needed for prometheus-operator to pickup scrape
targets.
Defaults to disabled so users need to opt in to deploy
* Added Apache license info to podmonitor yamls
