New wrapper types

Creating this design issue from https://github.com/microsoft/typespec/issues/4546 and previous discussions where we'd want to have a way to decorate/augment certain things that currently are just references to another types and so have no actual targetable entities.

This includes things like
- Array element type
- Operation return type

This probably could be sorted in the type graph by adding a secondary property

```ts
returnType: Type;
returnTypeExpanded: ReturnType
```

But it also going to be an intresting problem on how this work with augment decorators as things like that already navigate to the reference `myOp::returnType`