[Feature Request] Support Compact encryption scheme for non-seed wallet data

[Sami32]

https://github.com/pythcoiner/bips/blob/encrypted_descriptor/bip-encrypted-backup.md

[andreasgriffin]

• it's not clear to me how it combines with https://github.com/pythcoiner/wallet_backup

[Sami32]

wizardsardine/liana#1807