Relax requirements about module names to also allow dash characters

[abravalheri]

Closes #162.

See details of the discussion in https://github.com/pypa/setuptools/issues/4316#issuecomment-2068123376.

[abravalheri]

@henryiii, I don't know what are your thoughts on this.

If you have any (conceptual) concerns, maybe https://github.com/pypa/setuptools/issues/4316 is a good place to discuss?

[henryiii]

Sorry, forgot or missed this. I think this is reasonable.