pyang: YANG Validator and Converter

A YANG (RFC 6020/7950) validator and converter, `pyang` provides tools for parsing, validating, and transforming YANG modules. It is primarily used as a command-line tool but also offers a Python API for programmatic access to perform validation, convert modules to formats like YIN (XML) or tree structures, and generate code. The project maintains an `active` development pace with frequent minor releases, currently at version 2.7.1.