Add Dutch Taxpayer Identification Number

[bart-westenenk-bex]

Specification can be source from:
https://taxation-customs.ec.europa.eu/online-services/online-services-and-databases-taxation/taxpayer-identification-number-tin_en

        check = 10
        while check == 10
          # Generate a random 8 digit number
          tin_number = rand((10**7)..((10**8) - 1)).to_s

          multipliers =
            9
              .downto(2)
              .each_with_index
              .map { |multiplier, position| multiplier * tin_number[position].to_i }

          check = multipliers.sum % 11
        end

        tin_number.to_s + check.to_s