Split native addon into its own package

[mhofman]

I've found the ObjectInfo and WeakTag concepts to be very powerful building blocks and used them directly in my shim for the WeakRefs proposal.

For this I am however directly loading the internal native bindings of your package, skipping the JS wrapper. Would you consider splitting your package in 2, and create a "native only" package that simply exports the native API?

[mhofman]

For the time being I've extracted the loading of the internal bindings of this package into its own package and published https://www.npmjs.com/package/@mhofman/weak-napi-native.

I needed it to avoid mixing CommonJS and ESM in the same package :)