[KYC Match / KYC Fill-in] ways to handle country/market specific attributes better

[ToshiWakayama-KDDI]

Problem description

To consider ways to handle country/market specific attributes better.
• dataType used as a discriminator would be useful to avoid duplication of concerned attributes
• polymorphism should help us to define new specific schemas inheriting from this first base and perhaps targeting specific countries's requirements
->Issue Proposition of design evolution #38 and Issue Polymorphism and discriminator for specific requirements #39 were created

(Spin off from Issue #65, item No.5, as per Action Item #13.03)

BR