If an environment diff looks like json, use a json differ like jd

Sometimes a environment diff is _actual_ plain json, diffed on one big single row.
As a result an entire screen is coloured red/green without really helpful semantics.
Even the `--character-oriented` is not really of great help at times (when the diff is a little bigger).

It might be possible to use something like https://github.com/josephburnett/jd to make the result more intelligible.

Since these tools are no haskell, a good way would be to optionally write files with old/new environments to disk, it then becomes trivial to do the semantic diffing by hand.