Add src/node/* code to node:: namespace

src/node/transaction.h

@@ -12,11 +12,13 @@
 
 class CBlockIndex;
 class CTxMemPool;
-struct NodeContext;
 namespace Consensus {
 struct Params;
 }
 
+namespace node {
+struct NodeContext;
+
 /** Maximum fee rate for sendrawtransaction and testmempoolaccept RPC calls.
  * Also used by the GUI when broadcasting a completed PSBT.
  * By default, a transaction with a fee rate higher than this will be rejected
@@ -57,5 +59,6 @@ static const CFeeRate DEFAULT_MAX_RAW_TX_FEE_RATE{COIN / 10};
  * @returns                    The tx if found, otherwise nullptr
  */
 CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const uint256& hash, const Consensus::Params& consensusParams, uint256& hashBlock);
+} // namespace node
 
 #endif // BITCOIN_NODE_TRANSACTION_H