Add helpers for `using` and `await using`

[rbuckton]

This adds the helpers from https://github.com/microsoft/TypeScript/pull/54505.

[rbuckton]

@jakebailey any further feedback?

[jakebailey]

No, I just didn't approve because I figured you'd want Andrew's opinion and not mine 😄

[rbuckton]

@DanielRosenwasser we will need to ship this in an update to tslib when we release 5.2 beta.

[DanielRosenwasser]

I think you can just release that now as a minor version.