Add support for Qatar TIN

[unho]

• https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Qatar-TIN.pdf

  In the case of individuals and entities under the jurisdiction of the GTA: The TIN consists of 10 digits. It begins with the number 5 which refers to the State of Qatar as a member of the Cooperation Council for the Arab States of the Gulf or Gulf Cooperation Council (GCC). The following 9 digits are generated by an algorithm. They include a check digit. In the case of entities under the jurisdiction of QFCA: In the case The TIN structure is T00000 – where the 0s represent the QFC License Number of the firms. Thus, QFC firm with License Number 00001 has T00001 as TIN.