Show xpubs for accounts

[proofofjogi]

Is your feature request related to a problem? Please describe.

In my don't trust verify attitude, I wanted to understand what the flavors in JAM are and what they do and if the seed phrase and address derivation works as expected. I always do that for new wallets. It was more difficult here, because xpubs were not shown. I could pull it off in the end, but considerable effort was required.

Describe the solution you'd like

Would be good to have a power user mode where users can display xpubs/zpubs for each flavor (account)