fix(sync): add cooperative hard-cancel support#2

dolcalmi wants to merge 3 commits intopr-base-v0.30.3blinkbitcoin/bdk:pr-base-v0.30.3from

blink-v0.30.4-sync-hard-cancelblinkbitcoin/bdk:blink-v0.30.4-sync-hard-cancelCopy head branch name to clipboard