Add TIN number for Hong Kong

[unho]

• According to https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Hong-Kong-TIN.pdf it is called "Bussiness Registration number" (short "BR" or "BRN" or "BR No.") (商業登記號碼 in chinese) and it is 8 digits long.
• https://www.sgbt.lu/fileadmin/user_upload/SGBT/PDF/Compliance/CRS_2018/20191031_TIN_Leaflet_EN.pdf
• https://github.com/arthurdejong/python-stdnum/files/4434375/CRS_TIN.pdf (attached on issue Add support for more VAT numbers #124)
• http://demoen.tindb.cz/country-hk.html
• https://sleek.com/hk/resources/hong-kong-business-registration-number-vs-company-registration-number/
• https://www.paulhypepage.com.hk/what-are-the-functions-of-a-business-registration-number/
• https://getstarted.hk/business-registration-br-number-vs-company-registration-cr-number/
  • It is the first 8 digits at the begining of the Business Registration Certificate Number, which in turn has the 22222222-XXX-XX-XX-X format.
• https://blog.startupr.hk/hong-kong-business-registration-number-brn/

Online search:

• https://www.gov.hk/en/residents/taxes/etax/services/brn_enquiry.htm
• https://www.gov.hk/tc/business/registration/businesscompany/index.htm
  • Instructions on:
    • https://getstarted.hk/business-registration-br-number-vs-company-registration-cr-number/
    • https://blog.startupr.hk/hong-kong-business-registration-number-brn/

Examples:

• 31130878 from https://minterellison.com.hk/legal-notices/
• 52399423 from http://www.ircgroup.com.hk/en/ir1.php
• 71623118 from https://hk-mask.com.hk/
• 33120398 from https://www.kaizencpa.com/download/hk/kaizenBRC.jpg
• 34647541 from http://prestigeltd.com.hk/licences.htm
• 58443527 from http://www.massageonthego.com.hk/m/en/about-us.html
• 34214805 from https://www.kinglead.com.hk/portfolio/preciosa-lighting-hong-kong-testimonial-aug-2012/
• 12004664 from http://sogodesignhk.com.hk/en/minor-works
• 71536751 from https://www.colemoi.com.hk/legal-notice
• 1767 4094 from https://www.thailin.com.hk/?page_id=9
• https://www.info.gov.hk/gia/general/200803/03/P200803030196.htm
  • 13603580
  • 34773491
  • 34395970
  • 33833767
• 65556656 from http://www.kdklabs.com.hk/
• 15538767 from https://www.clare.com.hk/address.php
• 58650623 from https://www.customs.gov.hk/filemanager/common/pdf/undertake/20140616.pdf