Benchmark stdlib compression code

At PyConUS, I was chatting with @gpshead about adding compression benchmarks. While a lot of the "heavy lifting" of compression happens in the libraries CPython binds (zlib, liblzma, etc.), the handling of output buffers in CPython has a significant impact in performance, and is something we don't have a lot of visibility into the performance of.

One of the better known cross-algorithm compression benchmarks I'm aware of is lzbench, which tests compression performance of the Silesia compression corpus across many algorithms. I figure running compression benchmarks at varied settings on Silesia would provide a good starting point for benchmarking the output buffer and other binding code.

未指定文件、测试或入口点。首先检查 pyperformance 现有的基准测试结构，然后比较 lzbench 的 Silesia 方法以及 zlib/liblzma 绑定，以确定多种设置和输出缓冲区测量方式。完成的标准是具备可复现的压缩基准测试，能够体现 issue 中所描述的 CPython 端性能。