[ORM] CreateRelationField typing is missing when creating a delegated Model from a polymorphic Model

[iPommes]

Description and expected behavior
When wanting to create a new model with the create or createMany methods on a submodel of a delegated model (so Main has the @@delegate and Sub is a delegate of Main and you want to create a Sub entity) and this sub model has a relation the usual CreateRelationField typing is missing on all relation fields and only will be undefined.

Environment (please complete the following information):

• ZenStack version: 3.8.3
• Database type: PostgreSQL
• Node.js/Bun version: 1.3.14
• Package manager: Bun

Example schema

model Main with Base {
  item   Item   @relation(fields: [itemId], references: [id], onDelete: Cascade)
  itemId String

  @@unique([permissionId, itemId])
  @@delegate(type)
}

model Sub extends Main {
  group   Group  @relation(fields: [groupId], references: [id], onDelete: Cascade)
  groupId String
}

and then creating a Sub via zenstack.sub.create:

      await db.sub.create({
        data: {
          item: // <-- this is undefined and untyped
          group: // <-- aswell as relation lying directly on the Sub
        },
      })

usually there will be functions like connect, create, ...