[REQUIREMENT][Go Service] Support localized city name list

[lyiyu66]

Is your feature request related to a problem? Please describe.
I need to get a localized cities name list according to specific language/region from Singleton Service

Describe the solution you'd like
Add an API in Singleton Service to get a localized cities name list from CLDR

Describe alternatives you've considered
A clear and concise description of any alternative solution or feature you've considered.

Additional context
Document, please refer to http://www.unicode.org/reports/tr35/#Unicode_Subdivision_Codes
CLDR data: https://github.com/unicode-org/cldr/blob/master/common/subdivisions/en.xml

[lyiyu66]

The testing is done on commit:2ee15aa8da722e980cad0664283f4c719db5a289
Found issue: #2477