Sorted Strings Table is a file of key/value string pairs, sorted by keys
But it is not clear what fields SSTable entity (class) should have
Should we store all values?
It is clear that we save the shift for each key, but I still cannot fully understand how to store all this
After reading a good article, I still don't fully understand: https://www.igvita.com/2012/02/06/sstable-and-log-structured-storage-leveldb/