@Get
    @Post
    @Path("/api/v1/format_query")
    public HttpResponse format_query(@Param("query") String query) throws IOException {
        QueryFormatRsp rsp = new QueryFormatRsp();
        rsp.setData(query.replaceAll("\\s", ""));
        return jsonResponse(rsp);
    }
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