npm: Add latest version, update build (#34947)

* npm: Add latest version, update build

The `npm` package had gotten a bit long in the tooth and only suported the last version
for which running `configure` / `make` / `make install` actually worked.

- [x] Update the package to support npm@9, in which `npm install .` works properly and
  installation is easier.

- [x] Update the package so that `npm@6:8` also install successfullly. The incantation
  that is *supposed* to work on these versions is `node bin/npm-cli.js install $(node
  bin/npm-cli.js pack . | tail -1)`, but depending on the version one of `npm install`
  or `npm pack` will fail when run straight from the install directory. So now we just
  manually copies things over.

This seems to make the `npm` install much more reliable for all of `npm@6:9` (at least
for me).

udpates the `npm` build to support versions 6-9 and fixes the install for all of
them on macos.

* update for review

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