Created Transformers and validators for easy constraint resolution.

[Wicpar]

Added support for transforming and validating annotations during serialization.

Currently Supported: @LowerCase applies .toLowerCase on String @Trim applies .trim on String

New validators can be added by declaring a new openapi module in the search path:

in the config:

install(OpenAPIGen) {
    ...
    scanPackagesForModules = arrayOf("com.example")
}

in com.example.TestValidator

@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.PROPERTY)
annotation class TestAnnot

object AnyValidator : AValidator<Any, TestAnnot>(Any::class, TestAnnot::class) {
    override fun validate(subject: Any?, annotation: TestAnnot): Any? {
        println(subject)
        // return transformed object or throw exceptions that you will handle with the route exception handlers
        return subject
    }
}