Updates K8s security checks

[scottford-io]

This is a pretty major overhaul of the K8S security policy checks. This PR uses the most current style of check writing to ensure checks return "clear, accurate, and actionable" results.

Current Method Example: Container should not allow privilege escalation

The current check is written as follows:

      k8s.deployment {
        initContainers {
          securityContext['allowPrivilegeEscalation'] != true
        }
        containers {
          securityContext['allowPrivilegeEscalation'] != true
        }
      }

While the check does make an assertion, the results return data.

k8s.deployment: {
  initContainers: []
  containers: [
    0: {
      securityContext[allowPrivilegeEscalation] != true: true
    }
  ]
}

Updated Method: Container should not allow privilege escalation

This PR updates the check as follows:

k8s.deployment.initContainers.all( securityContext['allowPrivilegeEscalation'] != true )
k8s.deployment.containers.all( securityContext['allowPrivilegeEscalation'] != true )

The results from a passing check look like this:

[ok] value: true

The results from failed check will return the following:

[failed] [].all()
  actual:   [
    0: k8s.container {
      securityContext: {
        privileged: false
      }
      securityContext[allowPrivilegeEscalation]: null
      name: "dvwa"
    }
  ]

[mm-weber]

Thanks for this great addition @scottford-io ! It goes a long way making our policies more clean.
Hope the comments help.

[scottford-io]

@mm-weber all recommendations have been added. Thank you for the great review!

[mm-weber]

LGTM