Resize shortcut

[strowk]

Is your feature request related to a problem? Please describe.
Sometimes I need to see list of containers with their images, but size of screen does not allow to see both panes wide enough.

Describe the solution you'd like
In that case I would like ability to resize panes with shortcuts, something like in tmux (I mean oh-my-tmux additional bindings).

Describe alternatives you've considered
Hiding right pane (with container details) could also work, but have a bit less application. Resizing could be nice just for better view in different situations, hiding is like resizing, but more ultimate and also probably would have to take more corner cases into consideration, like what scrolling shortcut would have to do when the right pane is hidden.

Additional context
picture is showing how I have container with long name and cannot see its image (or other container as well) because there is just not enough place, but I do not ATM need to look at the logs and could resize/hide them

[jesseduffield]

This is done in #372

[jesseduffield]

#372 is now in master. Lemme know if you want to re-open.