disable "library-udf" temporarily for let jenkins CI passing, and call for code review

[Xiangdong Huang <sa...@gmail.com>]

Hi,

I see the mailing list alaways receives [build-failure] notification mails.

After check the result, I find it is because we merged "library-udf" [1].

"library-udf" originally is called "IoTDB-Quality", but in PR [1], we just
merged the docs,
and the pom file, which leads to the failure of Jeninks CI (the module has
no Java file now,
but the pom file trying to pack a jar file and upload...)

So, I will temporary disable the module.

BTW,  the source codes of "library-udf" has been submitted (there are
several PRs: series discover [2], String processing [3], data matching [4],
anomaly detection [5],  data repairing [6], frequency domain processing
[7], data profiling [8], data quality [9]).

Call contributors to review the codes.

Once one of the PRs are merged, we can enable the module.

[1] https://github.com/apache/iotdb/pull/4688
[2] https://github.com/apache/iotdb/pull/4848
[3] https://github.com/apache/iotdb/pull/4836
[4] https://github.com/apache/iotdb/pull/4835
[5] https://github.com/apache/iotdb/pull/4834
[6] https://github.com/apache/iotdb/pull/4833
[7] https://github.com/apache/iotdb/pull/4824
[8] https://github.com/apache/iotdb/pull/4731
[9] https://github.com/apache/iotdb/pull/4691

Best,
-----------------------------------
Xiangdong Huang
School of Software, Tsinghua University

 黄向东
清华大学 软件学院