Support orderBy nulls for relational fields

[Weakky]

Problem

It's currently impossible to order by null on relational field.

Suggested solution

model Post {
  id Int @id
  title String

  authorId Int
  author User @relation(
}

model Author {
  id Int @id
  name String?
}

await prisma.post.findMany({
  orderBy: { author: { name: { sort: 'asc', nulls: 'last' } } }
})

[henrymcl]

this would really help