message: support LRO for managed identity sql control
diff: "produces": [
  "application/json"
  ],
  + "x-ms-long-running-operation": true,
  + "x-ms-long-running-operation-options": {
  + "final-state-via": "azure-async-operation"
  + },
  "x-ms-examples": {
  "Create or update managed identity sql control settings": {
  "$ref": "./examples/CreateOrUpdateManagedIdentitySqlControlSettings.json"
  