What is the current behavior?

As of #3694 the NodeInfo provider includes CcInfo for the NodeJS N-API headers.

While useful for native addon development, this made the node_toolchain depend on the C++ toolchain as that CcInfo instance is pulled from the cc_library target :headers.

For workflows that don't need those headers, they incur the penalty of fetching the C++ toolchain. This can play out as;

• A sub-second delay while the repo fetches.
• A much more substantial delay (e.g. if using nixpkgs_cc_configure from https://github.com/tweag/rules_nixpkgs)
• An error due to the C++ toolchain not being defined.

Describe the feature

Introduce a separate toolchain targeted at native addon development so that plain JS workflows do not implicitly depend on C++ toolchains.