Add method to validate if values has required keys

library/common/templates/lib/schema/_utils.tpl

+{{/*
+Checks if a list of keys are present in a dictionary
+*/}}
+{{- define "common.validateKeys" -}}
+{{- $values := . -}}
+{{- if and (hasKey $values "values") (hasKey $values "checkKeys") -}}
+{{- $missingKeys := list -}}
+{{- range $values.checkKeys -}}
+{{- if eq (hasKey $values.values . ) false -}}
+{{- $missingKeys = mustAppend $missingKeys . -}}
+{{- end -}}
+{{- end -}}
+{{- if $missingKeys -}}
+{{- fail (printf "Missing %s from dictionary" ($missingKeys | join ", ")) -}}
+{{- end -}}
+{{- else -}}
+{{- fail "A dictionary and list of keys to check must be provided" -}}
+{{- end -}}
+{{- end -}}