message: refactor: Call type-solver earlier in decodescript
  Also, remove std::string type.
diff: @@ -574,18 +574,16 @@ static RPCHelpMan decodescript()
  }
  ScriptPubKeyToUniv(script, r, /* include_hex */ false);
  - UniValue type;
  - type = find_value(r, "type");
  + std::vector<std::vector<unsigned char>> solutions_data;
  + const TxoutType which_type{Solver(script, solutions_data)};
  - if (type.isStr() && type.get_str() != "scripthash") {
  + if (which_type != TxoutType::SCRIPTHASH) {
  // P2SH cannot be wrapped in a P2SH. If this script is already a P2SH,
  // don't return the address for a P2SH of the P2SH.
  r.pushKV("p2sh", EncodeDestination(ScriptHash(script)));
  // P2SH and witness programs cannot be wrapped in P2WSH, if this script
  // is a witness program, don't return addresses for a segwit programs.
  - if (type.get_str() == "pubkey" || type.get_str() == "pubkeyhash" || type.get_str() == "multisig" || type.get_str() == "nonstandard") {
  - std::vector<std::vector<unsigned char>> solutions_data;
  - TxoutType which_type = Solver(script, solutions_data);
  + if (which_type == TxoutType::PUBKEY || which_type == TxoutType::PUBKEYHASH || which_type == TxoutType::MULTISIG || which_type == TxoutType::NONSTANDARD) {
  // Uncompressed pubkeys cannot be used with segwit checksigs.
  // If the script contains an uncompressed pubkey, skip encoding of a segwit program.
  if ((which_type == TxoutType::PUBKEY) || (which_type == TxoutType::MULTISIG)) {
  