> This introduces a minimalistic test wallet, which can be used as a drop in replacement for the Bitcoin Core wallet to create dummy transactions with a given fee rate.
This is a backport of [[https://github.com/bitcoin/bitcoin/pull/19800 | core#19800]]
I reworked it to make it work with a simple privkey/address pair, as the
original PR was using anyone-can-spend P2WSH dark-magic.