Zio: Use proper package names

[durban]

Since the package names are changing anyway, maybe it's not too late to change them to the reverse domain name (i.e., dev.zio._).

[neko-kai]

Eh, IMHO just zio is better. Definitely more concise!

[iravid]

Have to agree with @kaishh

[durban]

I don't buy it. It's just 4 additional characters (7 total), and in return we don't screw with people who may want to create, e.g., some zio interop packages in their projects (foo.bar.interop.zio).

[ghostdogpr]

Closing this one as there seems to be consensus for keeping the current package name.