util: move error.h TransactionError enum to node/types.h

New node/types.h file is analagous to existing wallet/types.h and is a better
place to define simple node types that are shared externally with wallet and
gui code than the util library.

Motivation for this change is to completely remove util/error.h file currently
holding TransactionError in a followup commit.

src/Makefile.am

@@ -234,6 +234,7 @@ BITCOIN_CORE_H = \
   node/timeoffsets.h \
   node/transaction.h \
   node/txreconciliation.h \
+  node/types.h \
   node/utxo_snapshot.h \
   node/validation_cache_args.h \
   noui.h \

src/node/types.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2010-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+//! @file node/types.h is a home for public enum and struct type definitions
+//! that are used by internally by node code, but also used externally by wallet
+//! or GUI code.
+//!
+//! This file is intended to define only simple types that do not have external
+//! dependencies. More complicated types should be defined in dedicated header
+//! files.
+
+#ifndef BITCOIN_NODE_TYPES_H
+#define BITCOIN_NODE_TYPES_H
+
+enum class TransactionError {
+    OK, //!< No error
+    MISSING_INPUTS,
+    ALREADY_IN_CHAIN,
+    P2P_DISABLED,
+    MEMPOOL_REJECTED,
+    MEMPOOL_ERROR,
+    INVALID_PSBT,
+    PSBT_MISMATCH,
+    SIGHASH_MISMATCH,
+    MAX_FEE_EXCEEDED,
+    MAX_BURN_EXCEEDED,
+    EXTERNAL_SIGNER_NOT_FOUND,
+    EXTERNAL_SIGNER_FAILED,
+    INVALID_PACKAGE,
+};
+
+#endif // BITCOIN_NODE_TYPES_H

src/util/error.h

@@ -15,27 +15,11 @@
  * translating errors passed across wallet/node/rpc/gui code boundaries.
  */
 
+#include <node/types.h>
 #include <string>
 
 struct bilingual_str;
 
-enum class TransactionError {
-    OK, //!< No error
-    MISSING_INPUTS,
-    ALREADY_IN_CHAIN,
-    P2P_DISABLED,
-    MEMPOOL_REJECTED,
-    MEMPOOL_ERROR,
-    INVALID_PSBT,
-    PSBT_MISMATCH,
-    SIGHASH_MISMATCH,
-    MAX_FEE_EXCEEDED,
-    MAX_BURN_EXCEEDED,
-    EXTERNAL_SIGNER_NOT_FOUND,
-    EXTERNAL_SIGNER_FAILED,
-    INVALID_PACKAGE,
-};
-
 bilingual_str TransactionErrorString(const TransactionError error);
 
 bilingual_str ResolveErrMsg(const std::string& optname, const std::string& strBind);

src/wallet/types.h

@@ -3,12 +3,13 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-//! @file Public type definitions that are used inside and outside of the wallet
+//! @file wallet/types.h is a home for public enum and struct type definitions
-//! (e.g. by src/wallet and src/interfaces and src/qt code).
+//! that are used by internally by wallet code, but also used externally by node
+//! or GUI code.
 //!
-//! File is home for simple enum and struct definitions that don't deserve
+//! This file is intended to define only simple types that do not have external
-//! separate header files. More complicated wallet public types like
+//! dependencies. More complicated public wallet types like CCoinControl should
-//! CCoinControl that are used externally can have separate headers.
+//! be defined in dedicated header files.
 
 #ifndef BITCOIN_WALLET_TYPES_H
 #define BITCOIN_WALLET_TYPES_H