Associated types are not resolved in the IDE layer

Like the `T::S` here:

```rust
trait D {}

trait Foo {
    type S;
}

trait Bar<T>
where
    T: Foo,
    T::S: D,
{
}

fn main() {}
```

CC #4991

Another one:

```rust
trait Foo {
    type Bar;

    fn foo(_: Self::Bar);
}

struct S;

impl Foo for S {
    type Bar = i32;

    fn foo(_: Self::Bar) {
        todo!()
    }
}
```