[wallet] [zk] Properly introduce UpdateNullifierNoteMap(WithTx) to AddToWallet

[ch4ot1c]

Zcash: https://github.com/zcash/zcash/blob/13b41a6760c67524dd77afc67e7d556ec1ea71be/src/wallet/wallet.cpp#L1114 bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletDB* pwalletdb);

https://github.com/zcash/zcash/blob/13b41a6760c67524dd77afc67e7d556ec1ea71be/src/wallet/wallet.cpp#L1263 bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const CBlockIndex* pIndex, int posInBlock, bool fUpdate) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

Bitcoin signatures: bool AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose=true); bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const CBlockIndex* pIndex, int posInBlock, bool fUpdate) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

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[ch4ot1c]

#35 puts us on track for this change

[ch4ot1c]

IncOrderPosNext takes a WalletDB in Zcash, but WalletBatch in Bitcoin.