Add umaintained `num-format`

[pinkforest]

Fixes #1405

Mind reviewing this avisory @LovecraftianHorror @RalfJung

Would be nice to know if there are maintained fork(s) or alternative implementation(s) around to perhaps list

Cheers

https://github.com/bcmyers/num-format/issues/21, https://github.com/bcmyers/num-format/issues/27, https://github.com/bcmyers/num-format/issues/29

[CosmicHorrorDev]

My memory is hazy, but I think there are generally two aspects of num-format that people care about (and typically people only seem to care about one or the other). Localization and speed

I don't know of any alternatives that have a focus on speed, but the icu crate has support for localized number formatting (although that crate has much broader scope than num-format)

[pinkforest]

Thanks! Looks like the maintainer picked up so closing this -

https://github.com/bcmyers/num-format/issues/27#issuecomment-1272626722