private long getDefaultGasLimit(final ProtocolSchedule protocolSchedule) {
    return protocolSchedule
        .getChainId()
        .map(TESTNET_CHAIN_IDS::get)
        .orElse(DEFAULT_TARGET_GAS_LIMIT);
  }
Create merge block creator for block header and fee recipient.

@param header the header
@param feeRecipient the fee recipient
@return the merge block creator
consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/blockcreation/MergeCoordinator.java