Use dependency-group for "dev" and other non-user-facing dependencies

pyproject.toml specifies two types of dependency sets: "extras" and "groups." The first is specified by [project.optional-dependencies] (this is what we have now), and the second is specified by [dependency-groups]. Extras may be installed with the package-name[extra-name] syntax, while groups are not supposed to be user-facing, are not listed on PyPI, and may be installed with the --group flag.

I propose making "dev" a dependency group in the template and changing CI/setup scripts to use it this way. This will make the extras list cleaner.

https://packaging.python.org/en/latest/specifications/pyproject-toml/#dependencies-optional-dependencies
https://packaging.python.org/en/latest/specifications/dependency-groups/

LSDB at PyPI

Comienza inspeccionando la plantilla pyproject.toml junto con los scripts de CI y de configuración que instalan las dependencias de desarrollo. Actualiza la plantilla para que las dependencias de desarrollo y otras dependencias no destinadas al usuario utilicen [dependency-groups], y asegúrate de que esos scripts utilicen el mecanismo de grupos; se considera terminado cuando la lista de extras ya no contiene dependencias de desarrollo y la configuración del proyecto generado sigue siendo funcional.