Limit output lines

[nico202]

We can thing of a generic way to limit the output lines with an optional parameter (e.g., #+begin_src julia :limit 200) along with a defcustom variable if the output slows down the org buffer, but given that results can be hidden (org-cycle with the cursor over #+results:) I'd say that's low priority.

Originally posted by @nico202 in https://github.com/nico202/ob-julia/issues/7#issuecomment-826806918