Add "Import into Bitcoin Core Wallet" feature

[pcgeiger]

Currently, exporting a descriptor file requires a bunch of manual manipulation to get into a format that bitcoin core wallet expects with the importdescriptors command.

Add a button or dropdown menu next to the current descriptor functionality that displays the command to copy and paste into Bticoin Core console, ideally include the rescan command as well.

Here's the format Bitcoin Core expects:

importdescriptors "[{ \"desc\": \"descriptor\", \"timestamp\": \"now\", \"active\": true}]"