Maksim Chervonnyi

https://github.com/quiltdata/quilt/pull/3281

I think it was hard to read the one-liner, when it's not obvious which key are from the first level, and which from the second

Maybe, I'll wait feedback from customer who wanted these key/values (visually separated) in packages list

I'm going to decouple some changes to separate PRs for easier review

`hash` → `hashOrTag`: https://github.com/quiltdata/quilt/pull/3430