private void buildMatrixRsp(ParseResult parseResult, ExprQueryRsp response) {
        MetricRspData responseData = new MetricRspData();
        responseData.setResultType(ResultType.MATRIX);
        response.setData(responseData);
        MetricsRangeResult matrixResult = (MetricsRangeResult) parseResult;
        response.setStatus(ResultStatus.SUCCESS);
        responseData.getResult().addAll(matrixResult.getMetricDataList());
    }
OAP adopt time step by start/end,
reserve step/timeout param to keep consistent with API protocol.
oap-server/server-query-plugin/promql-plugin/src/main/java/org/apache/skywalking/oap/query/promql/handler/PromQLApiHandler.java