[Feat]: Metrics extension expose metrics on separate port

[AndersBennedsgaard]

Is your feature request related to a problem? Please describe.

It is a common pattern to expose metrics on a separate port (that is not exposed via Ingress) than the application server itself. Exposing /metrics to the "world" is not exactly acceptable for a production server.

Describe the solution you'd like

Make the metrics port configurable, such that setting extentions.metrics.prometheus.port=9090 exposes the metrics on port 9090, instead of what the HTTP port uses

Describe alternatives you've considered

No response

Additional context

No response