Wallet-free device onboarding

[adamkdean]

Ability to onboard devices with the CLI without restoring a wallet. This would work by running a command on a remote device which would initialise the device, generate a device wallet, and either present a QR code in the terminal or provide an authentication code. Users would then either use the mobile app to scan this QR code or using the web wallet or CLI, enter the code, and assign it to a stake. By doing this, it would negate the need to restore a wallet onto individual nodes.

The first step to this would be to introduce support for this into CLI and remove the requirement for a wallet to be restored in order to manage devices.

[PodTheCoder]

Pull request #138 in combination with an upcoming release of https://github.com/PodTheCoder/edge_staking_gui will enable wallet-free device onboarding without the user touching the terminal.

[PodTheCoder]

Added support for the CLI remote-stake flag in the GUI:
PodTheCoder/edge_staking_gui@2b174cb****

[annybs]

Strictly speaking this work pertains to wallet-free onboarding solely within the confines of CLI, so this issue will not be closed based on GUI capabilities.