Go-to-definition on `case` or `default` should jump to the containing `switch` statement if available.

```ts
/*END*/switch (null) {
  /*START*/case null: break;
}
```

```ts
/*END*/switch (null) {
  /*START*/default: break;
}
```

Those should work.

The following should not have issues.

```ts
export /*a*/default {}
```

```ts
export default { /*a*/case }
/*b*/default;
/*c*/case 42;
```
