[bitcoin/bitcoin] Update createmultisig RPC to support segwit (#13072)

@luke-jr The existing «legacy» address type (argument to `-addresstype` command line option) causes P2SH-multisig addresses for the multisig RPC. «p2sh-segwit» will cause P2SH-P2WSH-multisig addresses, and «bech32» will cause P2WSH-multisig.

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