Rebind `*print-namespace-maps*`

IME, many people dislike the `*print-namespace-maps*` default behavior, i.e. print namespaced maps at the repl.

It seems to me that cider-nrepl could change this default?

Right now, we observe options such as:

```clj
nrepl.middleware.print/options (dict
right-margin 70)
```

If we change the default, these options look like a nice place to let users opt out.

Start by reviewing nrepl.middleware.print/options and the current behavior of *print-namespace-maps* in cider-nrepl. Determine how changing the default and exposing an opt-out would fit the existing options, then verify that REPL output follows the selected setting.

Written by the indexing model from the issue text.