fix(utxo-bin): fix signature matching and add support for previous tx data #7134
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This PR addresses two main issues in the utxo-bin package:
Fixes signature matching in InputParser by replacing indexOf with findIndex
to properly match signatures using buffer equality comparison.
Adds support for providing previous transaction data directly through a
new --prevTx option in the parseTx command, eliminating the need to fetch
from remote sources. Also implements helper functions to extract previous
outputs from these transactions.
Related: BTC-0