[display] completion features in macro classes

Display features don't work very well with macro classes.

```haxe
class Main {
static function main() {
foo();
}

static macro function foo() {
macro class {
var test:Int;

function bar() {
test;
}
}
return macro {};
}
}
```

- hovering over anything in the class highlights the whole thing with `Array` (?)


- toplevel completion in `bar()` works, but not correctly (`test` doesn't show up for instance)
- find references on `test`'s usage instead finds random results (#7961)