Support packages shipping multi-config prebuilds

[kraenhansen]

With default options

• cmake-rn outputs into ./build/{configuration}/my-lib.apple.node and ./build/{configuration}/my-lib.android.node.
• react-native-node-api linking doesn't include the library configuration in the remapped name.

In most cases, the app developer is interested in the "MinSizeRel", "RelWithDebInfo" or "Release", but it's not necessarily clear to me, which would be a preferred default.
In rare cases, the app developer might also be interested in running the "Debug" prebuilt (if available).

Ideally, we would have a way for "react-native-node-api" to pick the right prebuilt based on some configuration (passed to react-native-node-api --link?).