The U2FSoftTokenManager is a synchronous implementation and thus didn't need a
timeout so far. We need it for the U2FHIDTokenManager though to let user
interaction timeout properly.
Thus, add a timeout argument to the methods required by the U2FTokenTransport
interface and forward that to the token manager implementations.
This patch adds a skeleton U2FHIDTokenManager that returns
NS_ERROR_NOT_IMPLEMENTED for ::Register() and ::Sign().
This will help test calling into the Rust library and make it easier to
implement the full USB HID transport.
Tim Taubert