In smithy4s-dynamic, jvm-only sources, we already have e.g. [`NodeToDocument`](https://github.com/disneystreaming/smithy4s/blob/b25cefe4d7d6b503dcb856f8b1ac2ad1a09d58bd/modules/dynamic/src-jvm/NodeToDocument.scala). I would also add: - `DocumentToNode` - conversions between smithy4s ShapeId and smithy-model ShapeId - more?