Add intranamespace authz policy

relates to #18 (closed)

Add this policy to allow all traffic from inside the namespace.

{{- if and .Values.istio.enabled .Values.istio.hardened.enabled -}}
apiVersion: security.istio.io/v1
kind: AuthorizationPolicy
metadata:
 name: allow-all-in-namespace
 namespace: {{ .Release.Namespace }}
spec:
  action: ALLOW
  rules:
  - from:
    - source:
        namespaces: [{{ .Release.Namespace | quote }}]
{{- end }}