message: Move DEFAULT_MAX_RAW_TX_FEE_RATE to node/transaction.h
  So it can be used in the GUI.
diff: #define BITCOIN_NODE_TRANSACTION_H
  #include <attributes.h>
  +#include <policy/feerate.h>
  #include <primitives/transaction.h>
  #include <util/error.h>
  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
  + * by these RPCs and the GUI. This can be overridden with the maxfeerate argument.
  + */
  +static const CFeeRate DEFAULT_MAX_RAW_TX_FEE_RATE{COIN / 10};
  +
  /**
  * Submit a transaction to the mempool and (optionally) relay it to all P2P peers.
  *
  