importNpmLock: init

This is an alternative to `fetchNpmDeps` that is notably different in that it uses metadata from `package.json` & `package-lock.json` instead of specifying a fixed-output hash.

Notable features:
- IFD free.
- Only fetches a node dependency once. No massive FODs.
- Support for URL, Git and path dependencies.
- Uses most of the existing `npmHooks`

`importNpmLock` can be used _only_ in the cases where we need to check in a `package-lock.json` in the tree.
Currently this means that we have 13 packages that would be candidates to use this function, though I expect most usage to be in private repositories.

This is upstreaming the builder portion of https://github.com/adisbladis/buildNodeModules into nixpkgs (different naming but the code is the same).
I will archive this repository and consider nixpkgs the new upstream once it's been merged.

For more explanations and rationale see https://discourse.nixos.org/t/buildnodemodules-the-dumbest-node-to-nix-packaging-tool-yet/35733

Example usage:
``` nix
stdenv.mkDerivation {
  pname = "my-nodejs-app";
  version = "0.1.0";

  src = ./.;

  nativeBuildInputs = [
    importNpmLock.hooks.npmConfigHook
    nodejs
    nodejs.passthru.python # for node-gyp
    npmHooks.npmBuildHook
    npmHooks.npmInstallHook
  ];

  npmDeps = buildNodeModules.fetchNodeModules {
    npmRoot = ./.;
  };
}
```

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