Shorthand for .iter() and .into(<Class>.collect)

## Problem
While working on advent of code 2021 I've noticed there is a quite a bit of boilerplate with both `.iter()` and `.into(<Class>.collect)`. Essentially converting a container too and from an iterator. I'd like to consider add some sort of sugar make this explicit still but shorter.

```
let a = [1,2, 3]$.map(|x| x).toList()
```