Support for Apple Watch to unlock Bitwarden on Mac

Add support to enable the option to use your Apple Watch to unlock Bitwarden on Mac.

(See implementation of the feature in 1password: Use your Apple Watch to unlock 1Password on your Mac)

It does even work with the Apple Watch through the TouchID interface if the Macbook display is opened. But when the display is closed, the TouchID Interface disappears and it doesn’t work anymore