Need to add zh-(gan|wuu|yue) into common/supplemental/supplementalMetadata.xml

Description

spin off from https://unicode-org.atlassian.net/browse/ICU-21115

The zh-gan, zh-wuu zh-yue should be added into https://github.com/unicode-org/cldr/blob/master/common/supplemental/supplementalMetadata.xml

(these are already in ICU coded as REDUNDANT in https://github.com/unicode-org/icu/blob/master/icu4c/source/common/uloc_tag.cpp#L153

Peter said there are other discussion about zh-cmn so I will put that into a separated ticket

From https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry

Type: redundant
Tag: zh-gan
Description: Kan or Gan
Added: 1999-12-18
Deprecated: 2009-07-29
Preferred-Value: gan
%%
Type: redundant
Tag: zh-wuu
Description: Shanghaiese or Wu
Added: 1999-12-18
Deprecated: 2009-07-29
Preferred-Value: wuu
%%
%%
Type: redundant
Tag: zh-yue
Description: Cantonese
Added: 1999-12-18
Deprecated: 2009-07-29
Preferred-Value: yue

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Reporter

Frank Yung-Fong Tang

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