[Request] Podman Discovery should be able to use container/pod Hostname automatically

[andrewazores]

Currently, Podman API discovery requires containers to be labelled like io.cryostat.connectUrl=service:rmi:jmx://.... The whole JMX URL, including the hostname and the port number, must be specified in this label. However, the hostname may be automatically generated, in which case the URL cannot be specified in advance. When Cryostat queries the Podman API for the list of running containers it will or can also retrieve information about the hostname of the container. If there is no label specifying the hostname to use for the Cryostat Discovery JMX connection, then the hostname should be inferred from this Podman API information.