private WorldStatePreimageStorage createPreimageStorage() {
    return new WorldStatePreimageKeyValueStorage(new InMemoryKeyValueStorage());
  }
Returns the first set of node hashes that would need to be requested from the network after
retrieving the root node in order to rebuild the trie represented by the given rootHash and
storage.

@param storage Storage holding node data required to reconstitute the trie represented by
    rootHash
@param rootHash The hash of the root node of some trie
@return A list of node hashes
ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastWorldStateDownloaderTest.java