@Override
  public List<PendingTransaction> promote(
      final Predicate<PendingTransaction> promotionFilter,
      final long freeSpace,
      final int freeSlots,
      final int[] remainingPromotionsPerType) {
    return List.of();
  }
Holds the current set of executable pending transactions, that are candidate for inclusion on
next block. The pending transactions are kept sorted by paid fee descending.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/layered/AbstractPrioritizedTransactions.java