In MONGOSH-336, we aggregated commands that span across multiple lines into one item in history.

For users who switch to editor mode (.editor) to write multi-line commands we should do the same for 2 reasons:

1. It makes it easier (or rather, possible) to re-run commands that were created in editor mode simply by doing "Arrow Up"
2. To not pollute shell history with things that are not useful and that are not even runnable, e.g. a closed bracket.