Addition to nox <query>: Display package versions from all channels and display commands

[kamadorueda]

As you may know there is no native way to know which nixpkgs commit should I install in order to have older versions of a package. This is because nix-env -qa usually offers 1 version (the latest). More about it here

So I think it would be awesome to embed into nox <query> the Nixpkgs Database so users can find all versions associated to a package and then add it to their projects easily, for instance $ nox nox can display information similar to this: https://kamadorueda.github.io/nixpkgs-db/#/pkg/nox (or display into console the data). The experience is up to us, please see below.

What I imagine is the best user experience possible is:

$ nox awscli

4 matching packages found:

0. awscli
1. awscli2
2. python27Packages.awscli
3. ....

Which package do you want to inspect? Please type the number
> 0

Available versions:

0. 1.9.6
1. 1.9.12
2. 1.7.47
3. ....

Which version do you want to install? Please type the number
> 1

Installing awscli @ 1.9.12

Done!

Let me know your thoughts !