new-pane size argument

[danielb2]

in a layout, I can easily specify the size of the new pane relative to the existing pane using the size directive. Could we have the equivalent in the new-pane action too?

If I wanted to stick to just command line forever whatever reason, I could move-focus and do resize-pane + multiple times, but that's not efficient

I propose adding a -s option for size

zellij action new-pane -d down -s 20 would open a pane which is 20% of the original