apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/ApolloOpenApiClient.java/ApolloOpenApiClient/createItem
class ApolloOpenApiClient:  public OpenItemDTO createItem(String appId, String env, String clusterName, String namespaceName,
      OpenItemDTO itemDTO) {
    return itemService.createItem(appId, env, clusterName, namespaceName, itemDTO);
  }