feat: add data model validation

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[LukasBicus]

• is the usage of 3rd party libraries welcomed (f.e. for validation of IBAN)?
• should the validation be arbitrary (configurable) or built-in?

[LukasBicus]

I'm going to implement this.

[xseman]

After a moment of consideration, it makes sense for the first iteration to optionally validate ISO standards that have a strict format. This would be especially useful for applications that consume the generated code and are limited to serialization for ISO standards (banks mobile applications).

To start, we can focus on checking three types of information:

• CurrencyCode (ISO 4217)
• CountryCode (ISO 3166)
• PaymentDueDate (ISO 8601)
• bic (ISO 9362)
• iban (ISO 13616:2003)

Maybe there are more fields with standards? @LukasBicus, could you take a look and see if I missed any? It seems like validator.js might be a good option for this task, since it supports all the standards I've identified so far.

[LukasBicus]

validator.js will be a great choice. I checked the references section of specification_v1.1.0.pdf. I will be a little more specific - the ISO 3166­1 alpha­3 will be used for country code validation (for example SVK).

I found no more ISO standards in the document.