Zuffer

Zuffer is equivalent of `bytes.Buffer` in Go without the ability to read. It is NOT thread-safe. In Memory mode, default allocator is used to allocate memory, which depending upon how the code is compiled could use jemalloc for allocations. In Mmap mode, `Zuffer` uses file mmap to allocate memory. This allows us to store big data structures without using physical memory. `max_size` can be set to limit the memory usage. [][Github-url] [][doc-url] [][crates-url] [][license-apache-url] [][license-mit-url]