DwarfStar as SDPK application

Ciao @antirez,

first of all thanks for making this project opensource. I just wanted to share with you a few thoughts that came to my mind reading the project documentation. Would it make sense to redesign DwarfStar as a native [SPDK](https://github.com/spdk/spdk) application? I would suggest to use it both for KV cache and for the streaming part. What do you think?
Many thanks in advance for any input on this.