@Override
  protected void prioritizeTransaction(final PendingTransaction pendingTx) {
    prioritizedTransactions.add(pendingTx);
  }
Holds the current set of pending transactions with the ability to iterate them based on priority
for mining or look-up by hash.

<p>This class is safe for use across multiple threads.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/sorter/GasPricePendingTransactionsSorter.java