[Core] Runtime Configuration of Targets

[fjogeleit]

Currently each change of a target requires a redeployment of Policy Reporter, to improve this behavior my idea would be to support runtime configuration of targets via ConfigMaps/Secrets with special labels.

Like the prom-operator uses config maps to define and configure dashboards, Policy Reporter should use ConfigMaps/Secrets to add/remove/update new targets at runtime without redeployments.