Apply decorator to a block of models?

Here's an abstraction of a scenario I have encountered:
```
@versioned("1" | "2")
namespace Widget;

model Foo {}

@added("2")
model Bar {
a: A;
b: B;
c: C;
}

@added("2")
model A {}

@added("2")
model B {}

@added("2")
model C {}
```

It would be nice if we had syntax that would support:
```
@versioned("1" | "2")
namespace Widget;

model Foo {}

@added("2") {
model Bar {
a: A;
b: B;
c: C;
}
model A {}
model B {}
model C {}
}
```

It would essentially be shorthand for "apply this decorator to all top-level things in this block". I have used this specifically in the context of the added/removed decorators where it makes the most sense to me. I don't think it generalizes to most decorators, but it potentially could.