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.

No se indican archivos, pruebas ni puntos de entrada. Empieza revisando la estructura de benchmarks existente de pyperformance y, después, compara la metodología Silesia de lzbench y los bindings de zlib/liblzma para definir configuraciones variadas y mediciones del búfer de salida. La tarea estará completada cuando haya benchmarks de compresión reproducibles que expongan el rendimiento del lado de CPython descrito en el issue.