d925565179
move pnpm.{fetchDeps,configHook} to fetchPnpmDeps and pnpmConfigHook
respectively. Also adds aliases to the former package-level attributes.
Additionally, pnpmConfigHook does not propagate pnpm anymore, to make
changing pnpm versions easier.
This brings pnpm in line with the other Node.js/JavaScript tooling in
nixpkgs.
This doesn't cause any rebuilds.
Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>