Backport: Add spent/created_txouts to SPK and Keychain TxOut indexes#2161

oleonardolima merged 4 commits intobitcoindevkit:release/chain-0.23.xbitcoindevkit/bdk:release/chain-0.23.xfrom

notmandatory:backport/send_recvd_txoutsnotmandatory/bdk:backport/send_recvd_txoutsCopy head branch name to clipboard