Fix opacity of opaque types on Scala 3

[neko-kai]

For opaque type S = String generate tag S instead of S::<String..String>

Breaks compatibility with previously generated tags for opaque types on Scala 3

[neko-kai]

Not sure how to release this, this will break binary compatibilty for opaque types if tags for them are generated in libraries.

@kitlangton I wonder how many libraries use opaque types with ZIO environment right now?

[kyri-petrou]

Not sure how to release this, this will break binary compatibilty for opaque types if tags for them are generated in libraries

Is it binary compatibility that it's breaking, or it's not backwards compatible as opaque types will now produce a different tag?

[neko-kai]

@kyri-petrou

Is it binary compatibility that it's breaking, or it's not backwards compatible as opaque types will now produce a different tag?

Second. Which is also the first, because if a tag is contained in a library, it will not match with a tag for the same type generated in user code.