apache / iotdb / #9345

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[To rel/0.13] M4 function & Equal Size Bucket Sample functions (#9538)

Currently M4 is implemented only in v1.0 and later versions. However, according to user needs, M4 is also required in v0.13. So this pr aims to add M4 function and also Equal Size Bucket Sample functions (EqualSizeBucketM4Sample is one of them) into rel/0.13. No new features but adapt the related codes, tests, documents, site references from master into rel/0.13.

Changes:
1. remove old M4 documents and site references
    - remove old M4 documents M4.md (bilingual)
    - remove references of old M4 documents in the site configuration file config.js

2. add new codes, tests, documents, site references for M4 function (keep the contents same as those in the master branch 44f046c)
    - M4 source code UDTFM4.java, BuiltinFunction.java
    - M4 integration tests added in IoTDBUDTFBuiltinFunctionIT.java
    - M4 documents added in Select-Expression.md (bilingual)
    - the site configuration file config.js already references the existing Select-Expression.md, so no need to add

3. add new codes, tests, documents, site references for Equal Size Bucket Sample functions (keep the contents same as those in the master branch 44f046c)
    - Equal Size Bucket Sample source code UDTFEqualSizeBucketSample.java, UDTFEqualSizeBucketRandomSample.java, UDTFEqualSizeBucketAggSample.java, UDTFEqualSizeBucketM4Sample.java, UDTFEqualSizeBucketOutlierSample.java, BuiltinFunction.java
    - Equal Size Bucket Sample integration tests added in IoTDBUDTFBuiltinFunctionIT.java
    - Equal Size Bucket Sample documents added in Select-Expression.md (bilingual)
    - the site configuration file config.js already references the existing Select-Expression.md, so no need to add

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