[core] Decorators are not added onto the anonymous type via metadata syntax

[ArcturusZhang]

If we have this:

model Foo {
  p: {
    a: string;
  };

we have the following syntax to add decorators to the anonymous model:

@@clientName(Foo.p::type, "NewName");

but in its type graph, the anonymous type never gets that decorator. And therefore it does not work at all.
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