nodePackages.asar: init at 0.14.0

[xvapx]

Motivation for this change

To add the asar command line utility, to be able to pack/unpack asar archives, which are used in some electron apps.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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This PR is the result of adding asar to pkgs/development/node-packages/node-packages-v6.json and then running pkgs/development/node-packages/generate.sh

[xvapx]

I think asar might be useful to edit some defaults in electron apps, which I would like to do in the work I'm doing on #32401, to modify a hardcoded directory.