Dump LevelDB content
There are lots of things about LevelDB been ignored in this script.
Since it can get me the data I want, I am happy with it.
It won't guarantee to work for others.
Be warned.
REF: https://blog.csdn.net/sparkliang/category_1342001.html
REF: https://www.cclsolutionsgroup.com/post/hang-on-thats-not-sqlite-chrome-electron-and-leveldb