feat: add selector expressions for interface{} & map based selections

[AmitKumarDas]

Problem Statement: It might be a good idea to perform selector matches against fields that are set with interface{} or map[string]interface{} datatypes. Since some of the datatypes used in a resource fall under above, having a selector expression on the same will be helpful.

We should also evaluate matching []interface{} as well as []map[string]interface{}

NOTE: []map[string]interface{} is popularly known as ListMap in Kubernetes.