message: add alert rule template version to stable version of the API
diff: "description": "The Name of the alert rule template used to create this rule.",
  "type": "string"
  },
  + "templateVersion": {
  + "description": "The version of the alert rule template used to create this rule - in format <a.b.c>, where all are numbers, for example 0 <1.0.2>",
  + "type": "string"
  + },
  "description": {
  "description": "The description of the alert rule.",
  "type": "string"
  