Add zellij support for multi panes

[dougg0k]

Hey,

Could you add support for multi-panes to be included in the same recording?

Currently it only seem to support a single one.

https://zellij.dev/

https://zellij.dev/tutorials/stacked-resize/

[ku1ik]

You can record whole zellij session by first starting asciinema rec and inside the asciinema session attaching to the zellij session.

You can do that in one command like this:

asciinema rec -c 'zellij attach' foo.cast