bo-selector: CSS Selector Parser

The `bo-selector` package provides a CSS selector parser capable of generating an Abstract Syntax Tree (AST) from a CSS selector string. It is built using `jison`, a parser generator, which is a development dependency, meaning the runtime package has no external dependencies. The package is currently at version 0.0.10 and has not seen updates since its last publish in October 2013, indicating it is an abandoned project. Its primary utility is to parse CSS selectors like `'p:has(.foo), b'` into a structured JavaScript object that represents the selector's components and relationships. It exclusively uses the CommonJS module system. Given its age and lack of maintenance, it is highly unlikely to support modern CSS selector features introduced after 2013, nor does it provide an ECMAScript Module (ESM) entry point, making integration into contemporary JavaScript projects challenging.