Using N-API but with Fixed Node module version

[mhdawson]

In some cases module owners would like to us N-API even if they are using other internal APIs like libuv, openssl.

Today that would be unsafe because N-API bypasses the Node module version check and therefore you should only use N-API for "pure" modules.

We should an an option through Macros or some other solution so people can use N-API but also use those other modules safely.

[gabrielschulhof]

nodejs/node#25539 proposes an ABI checking scheme.