add endpointslice template

common/templates/_endpointslice.tpl

+{{- define "common.endpointslice" -}}
+apiVersion: discovery.k8s.io/v1
+kind: EndpointSlice
+metadata:
+  name: {{ .Values.name }}
+  {{- with .Values.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  labels:
+    {{- with .Values.serviceName }}
+    kubernetes.io/service-name: {{ . }}
+    {{- end }}
+    {{- include "common.variables.labels" . | nindent 4 }}
+addressType: {{ .Values.addressType | default "IPv4" }}
+{{- with .Values.ports }}
+ports:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- with .Values.endpoints }}
+endpoints:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+---
+{{- end }}