Nested model property of type Date returned as string

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### Describe the bug

When retrieving type Date property on a nested model (property decorator) the property is returned as a string instead of Date.

```ts
@model()
class Nested extends Entity {
@property()
date: Date;
}

@model()
class Other extends Entity {
@property()
nested: Nested;
}
```

`typeof other.nested.date` should be Date but is string

Ran locally with memory db.

I also tried using @embedsOne, but couldn't get the decorator to work, the nested property wasn't saved on the other model instance.

### Logs

_No response_

### Additional information

_No response_

### Reproduction

/

Reproduce the TypeScript nested-model example with the memory database, starting from the property decorators and checking how the nested Date value is saved and retrieved. Done means other.nested.date is a Date rather than a string; the attempted @embedsOne behavior is also clarified if it remains in scope.

Written by the indexing model from the issue text.