References code lens does not include imports as references

还没有人认领这个 Issue。

For a project:

```ts
// abc.ts
export function abc() { }
```

```ts
// other.ts
import { abc } from "./abc";
```

The references code lens currently shows `0` references

I can understand why it's doing this but it also feels a bit unexpected. TS 6.0 includes the imports as references