Reimplement POD Discovery

[scoopex]

POD Discovery needs to be re -mplemented because old the drawbacks of the old implementation:

• name collisions
• not compatible to pods created besides of deployments
• code was hard to maintain

[scoopex]

https://github.com/zabbix-tooling/k8s-zabbix/tree/19_reimplement_pod_monitoring

[scoopex]

#20