Take a chunk of the input and return it.
interface IChunkConfig {
start?: string | number;
size?: string | number;
}const chunkMapperDefault = Mappers.chunk(); // Chunk: start:0|size:4
const chunkMapper7to11 = Mappers.chunk({ start: 7 }); // Chunk: start:7|size:4
const chunkMapper10to22 = Mappers.chunk({ start: 10, size: 12 }); // Chunk: start:10|size:12