Add support for policy language configmap

[surajssd]

Right now instead of going into implementing full-fledged CRDs, rely on a configmap for the policy information. The app will read the policy from a configmap with name fanotify-policy in fanotify-mon namespace with key policy. This policy will be parsed by the application to decide what pods should be selected for policy enforcement.

Here is the document to flesh out the policy language.

[vbatts]

Let's consider the Rego language, used by OPA https://www.openpolicyagent.org/docs/latest/policy-language/
https://pkg.go.dev/github.com/open-policy-agent/opa/rego

[vbatts]

Looks like our seccompagent is working with it as well kinvolk/seccompagent#12 (additional info https://github.com/kubearmor/KubeArmor/blob/main/getting-started/security_policy_specification.md)