ASDF Astropy Serialization Support

asdf-astropy is an extension library that provides ASDF (Advanced Scientific Data Format) serialization support for various Astropy objects. It allows for portable, hierarchical, and human-readable representation of data, including astronomical coordinates, units, and models. This package supersedes older ASDF plugins that were built directly into Astropy. The current version is 0.11.0, with releases generally synchronized with major Astropy and ASDF releases.