[Enhancement] Silent Payments support

[Sami32]

Describe your request

https://bitcoinops.org/en/topics/silent-payments/
https://github.com/bitcoin/bips/blob/master/bip-0352.mediawiki
http://silentpayments.xyz/docs/wallets
https://bitcoin.design/guide/how-it-works/silent-payments/

Edit:
https://docs.rs/silentpayments/latest/silentpayments/

[qlrd]

Studying the BIP for that, could be interesting if possible.

[qlrd]

To be supported, we will need PSBT v2

[Sami32]

https://github.com/bitcoin/bips/blob/master/bip-0375.mediawiki
https://bips.dev/375/

https://github.com/arminsabouri/app-bitcoin-new/blob/feat/complete-psbtv2/bitcoin_client_js/src/lib/psbtv2.ts
https://github.com/achow101/bitcoin/tree/psbt2

bitcoin/bitcoin#21283

[Sami32]

diybitcoinhardware/embit#96
diybitcoinhardware/embit#64