[FeatureRequest] Divide binaries to multiple npm packages according to platform

[k8w]

Discussed here: murat-dogan/node-datachannel#117

Prebuilt binaries for library node-datachannel is up to 80MB, but only 2MB would be used.

It may be better if there is a way to divide the prebuilt binaries to multiple npm packages automatically.
So that the main package would only install the specific platform package after npm install.

[vweevers]

#63