zipper: add canonical data (#934)
zipper: add canonical data (#934)

Closes https://github.com/exercism/problem-specifications/issues/593.

Of the seven tracks that had already implemented this exercise, five
(C#, F#, Haskell, OCaml, Scala) had the exact same test cases, and the 
other two (Erlang, Elixir) had the same test cases plus a few more
(identical) test cases. I opted to simply list all of the test cases I
found in the order they were in. 

I ran the test against the canonical-schema.json and it said the file is
valid.

rpottsoh/x-common,petertseng/x-common,jmluy/x-common,exercism/x-common,ErikSchierboom/x-common,jmluy/x-common,Vankog/problem-specifications,exercism/x-common,ErikSchierboom/x-common,jmluy/x-common,petertseng/x-common,Vankog/problem-specifications,rpottsoh/x-common