iotdb时间戳精度支持微秒、纳秒，但是udf最小时间单位只有毫秒

以udf中的re_sample为例，当iotdb时间戳精度设置为us时, re_sample()中参数‘every’设置为100ms时，实际重采样频率为100微秒，有单位错位问题，请教下这个问题如何解决？

Start with the UDF re_sample entry point and trace how the every parameter is interpreted when IoTDB timestamps use microsecond or nanosecond precision. Reproduce the reported case with every=100ms and microsecond timestamps, then establish the expected resampling interval and verify that the implementation uses the correct unit.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.