Changes to Submit W-8BEN-E tax form

added the pattern ^[A-Z0-9]{6}\.[A-Z0-9]{5}\.[A-Z]{2}\.[0-9]{3}$ to the request property giin

added the new optional request property chapter_4_certification

added the new optional request property disregarded_entity_branch

added the new optional request property limitation_on_benefits_other_detail

added the new optional request property tax_treaty_benefits/limitation_on_benefits

added the new optional request property tax_treaty_benefits/limitation_on_benefits_other_detail