Better control over security features #23
Description
Currently this library just exposes an option whether keys should be biometry backed.
I think it would be great if we can expose a better API for creating keys that allows to set the security configuration of a key.
It would be great if this library can be used for a range of different usages, where you just want to leverage the crypto from the native platform.
I think platform specific options is also fine here. Or as Expo often does, try to have cross-platform options, and then add platform specific options where it makes sense.