luarocks-nix: bumped to pass args too

[teto]

Motivation for this change

Motivations are:

• Provide an option to generate callPackage-compatible code? nix-community/luarocks-nix#9
• remove (or limit) the use of with; nix-community/luarocks-nix#4
• also I hope it makes it easier to retreive the lua dependencies of vimPlugins (parsing their rockspec, generate a lua derivation and just copy their buildInpuits as vim plugins dependencies)

I am not that comfortable with fixed point in nix so not sure what I did with the newScope callPackage stuff is correct.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• 21.11 Release Notes (or backporting 21.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[teto]

This updates luarocks-nix to generate packages via a scoped callPackage code like in the haskell ecosystem. It's cleaner as we dont need to rely on a with self;.
It makes overriding some arguments a bit harder though, hence the new overrideLuarocks function. Some arguments have to be overriden this way since the generation of the luarocks config needs the info. If we had structured attributes, we could geneate that config via a hook (cleaner) but until then that should do the trick.

Once this is merged, I can finally work on automating neovim lua plugins packaging.