feat(wasm-utxo): add chain code utilities for fixed-script wallets#91

OttoAllmendinger merged 1 commit intomasterBitGo/BitGoWASM:masterfrom

BTC-2650.add-wasm-utxo-chainsBitGo/BitGoWASM:BTC-2650.add-wasm-utxo-chainsCopy head branch name to clipboard