Add support for Lesotho TIN

[unho]

• https://www.pwc.co.za/en/assets/pdf/vat-in-africa-2017.pdf

  The format of the VAT registration number is TN0000000-0. It is called a tax identification number (TIN).

• https://www.lra.org.ls/faqs

  The difference between VAT number and TIN (Taxpayer Identification Number) is that:

  • TIN is allocated to every Client who has registered with RSL for tax purposes. It is a unique number given to each registered Client and holds all the information regarding all the tax types that a taxpayer is registered for (including VAT).
  • VAT number however is only allocated to a taxpayer who is registered for VAT.

• https://www.lra.org.ls/registrationde-registration

  Only one TIN is allocated for purposes of Income Tax, Customs and Excise, and VAT.

• It looks like TIN No is a common naming.

Examples (I could only find these):

• 2000840302-2 from https://www.laa.org.ls/wp-content/uploads/2021/03/13304-754.pdf
• 2000485576-9 from https://www.laa.org.ls/wp-content/uploads/2021/03/13303-2287.pdf
• 200002565-6 from https://leo.com.ls//wp-content/uploads/2021/07/domain-name-reg-international.pdf
• 200084089-8 from https://myloan.co.ls/tag/vehicle-finance-lesotho/
• 200072185-8 from https://themail.co.ls/wp-content/uploads/2020/11/The-Mail-Lesotho-Launch-Edition-Vol.1-No.1.pdf
• 1028676-4 from https://www.centralbank.org.ls/images/Publications/ANNUAL_REPORTS/2021_CBL_Annual_Report_-LR-Singles-17.11.2022-_29_November_2022.pdf