VMProbe supporting pods, not just ingresses

[paradisfm]

Is your feature request related to a problem? Please describe

I would like to create a gRPC probe for pods with certain labels using Blackbox Exporter.

Describe the solution you'd like

I would really appreciate an addition of pod support to targets the VMProbe can handle.

Describe alternatives you've considered

I'm trying to work around the ingress-only limitation with a VMPodScrape, but not having much luck thus far -- I can't seem to get pod discovery working in tandem with a blackbox probe.