xopen: Open Compressed Files Transparently

This Python module provides an `xopen` function that works like Python's built-in `open` function but also transparently deals with compressed files. `xopen` selects the most efficient method for reading or writing a compressed file, often leveraging external tools like `pigz` for parallel processing. It supports gzip (.gz), bzip2 (.bz2), xz (.xz), and optionally Zstandard (.zst) formats. The library is actively maintained, currently at version 2.0.2, and has a consistent release cadence.