Support useBeanValidation-configOption

[Chrimle]

Is your feature request related to a problem? Please describe.
I want fields to be annotated with @jakarta.validation.constraints.* - particularly @Nullable and @NotNull.

Describe the solution you'd like
Support useBeanValidation

Describe alternatives you've considered
None.

Additional context
None.

[Chrimle]

It will be difficult to stick to how it currently behaves, because it seems it is not intended for pojo/model, but actually api and other supporting files...

Best option as of right now, get inspiration from https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/Java/beanValidationCore.mustache, and try to get it as close as possible.