Prometheus support

[runningman84]

Is your feature request related to a problem? Please describe.
I would like to monitor the honeypot using prometheus.

Describe the solution you'd like
An optional http endpoint for some metrics.

Describe alternatives you've considered
Parsing the logfiles is also possible but cumbersome. Especially if you want to see the number of current active connections and so on.

Additional context
The cowrie process is running in k8s where prometheus is a common monitoring tool.