Type-check consent codes

[mcupak]

With OAS 3.0, we should be able to handle consent codes better by utilizing inheritance. I imagine we'd have classes containing enums for primary, secondary categories and requirements + a qualifier field for variable codes.

The hierarchy could probably be something like this:

• DataUseCondition
• QualifiedDataUseCondition -> DataUseCondition
• PrimaryDataUseCondition -> DataUseCondition
• SecondaryDataUseCondition -> DataUseCondition
• RequirementDataUseCondition -> DataUseCondition
• QualifiedPrimaryDataUseCondition -> QualifiedDataUseCondition
• QualifiedSecondaryDataUseCondition -> QualifiedDataUseCondition
• QualifiedRequirementDataUseCondition -> QualifiedDataUseCondition

We need to check how this behaves practically with codegen.