Refactor CanonicalIter to return CanonicalTxNode#2063

Rahamath-unnisa wants to merge 2 commits intobitcoindevkit:masterbitcoindevkit/bdk:masterfrom

Rahamath-unnisa:canonical-txnode-refactorRahamath-unnisa/bdk:canonical-txnode-refactorCopy head branch name to clipboard