Add support for model level definition

[michiim]

Would be great to have support for zod-definitions on model level.

example:

/// @zod.refine((val) => val.type === 'PRIVATE' || val.company !== null, { path: 'company', message: 'Required if type is company' })
model Address {
  id                         String      @id @unique @default(uuid())
  type                       AddressType
  company                    String? /// @zod.min(1).max(50)
  address                    String /// @zod.min(1).max(50)
  zipCode                    String /// @zod.min(1).max(10)
  city                       String /// @zod.min(1).max(50)
}

enum AddressType {
  PRIVATE
  COMPANY
}