Display wallet xpub/xpriv, derivation path, etc

Requested by fshinetop

Implementation is trivial. Use libauth's encodeHdPublicKey and encodeHdPrivateKey to get the xpub/xpriv.

In order to reduce cognitive overload for new users, this feature should be gated behind some kind of "advanced options" button on the SettingsWalletView.

Requested by Ian B

Also show derivation path

Edited May 17, 2023 by Kallisti

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