fix: disallow dashes in repo name

[cfcosta]

When creating a new repo, it is currently allowed to create with a dash in the name, which immediately fails aiken check:

This fixes it.

[KtorZ]

I think the better fix would be to actually allow hyphens in module names 🧐

There's some stylistic debate with this probably and I am sure @rvcas has a strong opinion on it.

But I'd find this to be a quite saddening user experience to realize only after having created a repository that the name is deemed invalid by the compiler. Especially on something as common as an hyphen.

[rvcas]

@KtorZ I told him to block it, we do not support kebab case as var names and will likely never support that and we'll probably also block camcelCase names. The alternative would be to catch this and then replace - with _ for them which can arguably be more confusing than presenting an error. but otherwise I would just block it.

That said I'd be pretty in favor of replacing - with _, seems chill and then you can name projects more flexibly. The only caveat is that the import will require an underscore. This is how it works in rust as well. For example if you name a crate aiken-lang it's available as aiken_lang.

[KtorZ]

I don't think replacing will work as it opens the gate to spoofing attacks now. Someone can register a project with underscore in the name and try to hijack an established one.

Given that repository names will never serve as variable identifiers, I think it's fine here to have the parser accept hyphens while still forbidding them in module and variable names

[rvcas]

@KtorZ register a project? You mean in some registry? I believe crates.io handles it fine.