Secure Area Interface: add KeyInfo to createKey return

[paulbastian]

In most use cases utilizing the Secure Area interface, you want to create a key and use the public key afterwards.
Right now, this requires two calls to the Secure Area interface.
Using a Remote Secure Area, it may require two network calls or some other local unnecessary quirks.
So the suggestion is to return the KeyInfo class for createKey function.

[davidz25]

Yeah, @sorotokin added this as part of a recent commit so that's done already. We'll get to all your other issues this week!