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

[AlanRemTT]

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？

[github-actions[bot]]

Hi, this is your first issue in IoTDB project. Thanks for your report. Welcome to join the community!

[jixuan1989]

well,

1. welcome to implementing a new udf that supports different time unit, as UDF is easy to extend. Then we can merge it into our codebase.
2. Or, the author of this UDF function @trin1t may fix the issue.