Add support for aliases in destructuring

Currently, we support simple destructuring of arrays and objects:

```ts
const [ a, b = 42, ...others ] = myArray;
const { a, b = 42, ...others } = myObject;
```

However, aliases are not yet supported:

```ts
const [ a, b: c, ...others ] = myArray;
const { a, b: c, ...others } = myObject;
```

This issue is about adding support for destructuring aliases in both arrays and objects.
