Add Pod and Cluster info modules

[adietrich-ussignal]

When trying to obtain information about pods and clusters in a given zone, having a module similar to zone_info would be helpful. The only context to when info about a cluster can be obtained is if the cluster was deployed with these modules or when the cluster name is known prior to any usage of these modules.

[adietrich-ussignal]

I see that the lookup plugin could be a suitable solution, but it feels inconsistent with the zone_info being a module and clusters and pods needing to use the lookup plugin.