util: move fees.h and error.h to common/messages.h

Move enum and message formatting functions to a common/messages header where
they should be more discoverable, and also out of the util library, so they
will not be a dependency of the kernel

The are no changes in behavior and no changes to the moved code.

src/test/fuzz/kitchen_sink.cpp

@@ -2,13 +2,13 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <common/messages.h>
 #include <merkleblock.h>
 #include <policy/fees.h>
 #include <rpc/util.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
-#include <util/error.h>
 #include <util/translation.h>
 
 #include <array>
@@ -16,6 +16,8 @@
 #include <optional>
 #include <vector>
 
+using common::TransactionErrorString;
+
 namespace {
 constexpr TransactionError ALL_TRANSACTION_ERROR[] = {
     TransactionError::MISSING_INPUTS,