Add Splitter to help split data into shards.
Add Splitter to help split data into shards.

justmao945/reedsolomon,lukechampine/reedsolomon,somethingnew2-0/reedsolomon,NicolasT/reedsolomon,NicolasT/reedsolomon,klauspost/reedsolomon,beni55/reedsolomon,fwessels/reedsolomon