pulsar-proxy with authentication and proxy-metrics for prometheus

**Is your feature request related to a problem? Please describe.**
when Authentication is enabled you cant get prometheus metrics from proxy, because he needs authentication.
the pod-monitor hasn`t an option to add this.

**Describe the solution you'd like**
Adding an option to values.yaml - in this case with jwt
like:
```
...
authorization:
key: TOKEN
name: token-name
...
```

Adding this to pulsar/templates/proxy-podmonitor.yaml

```
...
- authorization:
credentials:
key: {{ $.Values.proxy.podMonitor.authorization.key }}
name: {{ $.Values.proxy.podMonitor.authorization.name }}
type: Bearer
...
```

Start by reading values.yaml and pulsar/templates/proxy-podmonitor.yaml to understand the existing proxy pod monitor settings and structure. Add the requested authorization values and confirm the rendered pod monitor includes the Bearer credentials when configured, while preserving current behavior without them.

Written by the indexing model from the issue text.