Type node#name without generic args

[Blacksmoke16]

Requires #8429. Will make this a draft until thats merged, then can rebase.

This PR allows getting the name of a TypeNode without the type's type vars. The main use case for this is when iterating over the subclasses of a parent type, where the children have type vars, and you're wanting to include data from a macro or annotation as generic type arguments. Currently since the type vars were always included you couldn't just do like {{"#{type.name}(#{ann[:theType]})".id}} since that would expand to say SomeType(T)(Foo). This allows skipping the (T) to make supplying the generic types easier.

See https://github.com/Blacksmoke16/assert/blob/master/src/assert.cr#L152 where I have to gsub the type arguments away before adding my own.

[straight-shoota]

Maybe a a spec example that ensures the default behaviour with a generic type when ,generic_args is not set?