nixpkgs-vet suggests moving multi-version library to by-name

[Pandapip1]

See https://github.com/NixOS/nixpkgs/actions/runs/11827734660/job/32956454563?pr=355629

Arguably multi-version libraries should still be added to pkgs/development/libraries until a solution can be found that's better than hard-to-maintain bunch of individual <packagename>_<version>/package.nix files.

[willbush]

Have you considered this recommendation for new packages with multiple versions?

[Pandapip1]

I didn't see that. It would be great if nixpkgs-vet could point to that; I didn't even realize that by-name had a README!