JSDoc imported types from namespaced packages do not work

This works:
```js
/**
* @type {import(./types).CustomType}
*/
let v1 = "something"
```

However, this doesn't:
```js
/**
* @type {import(@someNamespace/package).CustomType}
*/
let v1 = "something"
```

The  problem is this line https://github.com/alexprey/sveltedoc-parser/blob/dev/lib/utils.js#L7
That regex fails because of the second `@` symbol on that line.