We use Jandex as the language model all across Quarkus, and Gizmo is very often used in Quarkus. We should provide some level of integration, for example:

• create a method from Jandex MethodInfo (meaning: use the name, signature, modifiers)
• create a field from Jandex FieldInfo (meaning: use the name, type, modifiers)
• add a Jandex AnnotationInstance as an annotation
• maybe a few more

This doesn't necessarily have to be in the main Gizmo module, if we don't want a Jandex dependency. We could create a second module just for this.