feat: add needsXpubsForColdSigning capability method - #9430
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Adds a coin-level capability so callers can check whether a built transaction requires xpubs/derivation paths for cold signing instead of sniffing tx format themselves. PSBT transactions carry BIP-32 derivation info inline, so xpubs are only needed for legacy UTXO txs TICKET: WCN-1799
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Adds a coin-level capability so callers can check whether a built transaction requires xpubs/derivation paths for cold signing instead of sniffing tx format themselves. PSBT transactions carry BIP-32 derivation info inline, so xpubs are only needed for legacy UTXO txs.
TICKET: WCN-1799