Allow consumers to check if device is attached #2
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This PR exposes the ability to check if a FIDO2 device is attached.
Whilst adding PIN-less support to the Xcodes app, it had become evident that in order to support a nice UX around the PIN-less assertation we need a way to know if a device is present.
It is possible to kind of achieve this with the current API that the library has but it does put the onus of dealing with errors on the consumer of the API. This change should hopefully make that much simpler for upstream projects.
I've also added a little UI into the dev app to check this functionality.
