feat(sdk-coin-flrp): add optional utxoHex property to DecodedUtxoObj type

TICKET: WIN-8498

Author: mohd-kashif

modules/sdk-coin-flrp/src/lib/iface.ts

@@ -60,6 +60,7 @@ export type DecodedUtxoObj = {
   outputidx: string;
   threshold: number;
   addresses: string[];
+  utxoHex?: string;
   addressesIndex?: number[];
 };