Add validation for Vietnam TIN

[unho]

• It is called "Mã số thuế" (translated as "Tax Code") or "MST" (short version) and it is 10 digits long.
  • Also called "Mã số người nộp thuế" (translated as "Taxpayer Identification Number") according to image of some official certificate in https://easyinvoice.vn/ma-so-thue/ but Google tells that the above one is much much commonplace.
• https://vi.wikipedia.org/wiki/Thu%E1%BA%BF_Vi%E1%BB%87t_Nam#M%C3%A3_s%E1%BB%91_thu%E1%BA%BF_(MST)_c%E1%BB%A7a_doanh_nghi%E1%BB%87p includes description and details about structure.
• https://easyinvoice.vn/ma-so-thue/
• https://ub.com.vn/threads/huong-dan-tra-cuu-ma-so-thue-doanh-nghiep-moi-nhat.261393/
• https://vietluat.vn/nhung-dieu-can-biet-ve-ma-so-thue-ma-so-doanh-nghiep.html
• https://dhlaw.com.vn/ma-so-thue-la-gi-y-nghia-ma-so-thue/

Online search:

• http://tracuunnt.gdt.gov.vn/tcnnt/mstdn.jsp
• https://masothue.vn/

Implementations:

• Excel formula https://www.giaiphapexcel.com/diendan/threads/c%C3%B3-c%C3%A1ch-n%C3%A0o-ki%E1%BB%83m-tra-m%C3%A3-s%E1%BB%91-thu%E1%BA%BF-c%C3%B3-ph%C3%B9-h%E1%BB%A3p-tr%C6%B0%E1%BB%9Bc-khi-l%C3%AAn-h%C3%B3a-%C4%91%C6%A1n-kh%C3%B4ng.22792/#post-158100
• https://www.giaiphapexcel.com/diendan/threads/ki%E1%BB%83m-tra-m%C3%A3-s%E1%BB%91-thu%E1%BA%BF-h%E1%BB%A3p-l%E1%BB%87-b%E1%BA%B1ng-excel.3537/#post-24446
• https://www.giaiphapexcel.com/diendan/threads/ki%E1%BB%83m-tra-m%C3%A3-s%E1%BB%91-thu%E1%BA%BF-h%E1%BB%A3p-l%E1%BB%87-b%E1%BA%B1ng-excel.3537/#post-155906
• https://www.giaiphapexcel.com/diendan/threads/ki%E1%BB%83m-tra-m%C3%A3-s%E1%BB%91-thu%E1%BA%BF-h%E1%BB%A3p-l%E1%BB%87-b%E1%BA%B1ng-excel.3537/#post-154873
• (download link is broken, but I asked the author and he kindly shared the code) https://tinhte.vn/thread/133546#post-1184823
  • The shared code ChkCont.cpp.zip

Examples:

• 0105958840 from https://masothue.vn/0105958840-cong-ty-co-phan-giai-phap-cong-nghe-wiki
• https://masothue.vn/

  3300273243-005 4900813164 5800199577-002 5900705097 0314179100 5500340437 0201909807 0201910834 5200869050 0314409058-002 1300440846-008 3301595028 1600699712-004 3100104093-009 2000730546-015 2000961769-009 5200327611 0103131621 4401031161 5400478872 0102641429-066 3702499152 4001100318 1600255033-006 4900224296 3400416992-007 0700790272

• Found on the Internet

  0100112437011 0101245486 0102182292 0102723382 0105330703 0105958840 0106142205 0106713191 0106824279 0107338930 0107371744 0107430703 0107526719 0107959889 0107984081 0108024302 0108256430 0108747679 0108880215 0109120150 0109161862 0300533351 0302082048 0303104343 0304475742 0304541339 0305000124 0305060028 0305322160 0306404183 0308023320 0309485335 0311592398 0311693854 0311892472 0311933841 0312386285 0312615305 0312971744 0313322647 0313511637 0313844499 0313883096 0314390745 0314425155 0314715626 0314797650 0314817730 0315469356 0315641254 0315649013 0315675711 0316095304 0316110224 0400129230 0401 443 048 0401958914 1601223524 1801314923 2500291713 2901807716 3200707377 3602404615 3603718156 3700635642 3700751416 3702642596 3900956516 4000107409 4001170925 4200919944 4201783848 8037630690 8463763902 2000102580 2000102580-001 2000102580-002 2000102580-003 2000102580-004 2000102580-005 2000102580-006 2000102580-007 2000102580-008 2000102580-009 2000102580-010 2000102580-011 2000102580-012 2000102580-013 2000102580-014

[arthurdejong]

Thanks! Merged as a34a76d.