Allow for `Alt-Space`, `Ctrl-Space`, `Ctrl-Tab` bindings

[TheSast]

As suggested to me on the Zellij discord server I used the plugin zellij-echo to check which keypresses where correctly seen by Zellij and to try and use those.

That plugin show that it is possible to use Alt-Space and Ctrl-Tab, it also shows how Ctrl-Space is interpreted as nul value

Yet it is not possible to bind those keys inside the Zellij config file

Space is a pretty commonly user set prefix / leader key is some programs (e.g. vim) as such a modified version of it makes sense as a replacement for the terminal multiplexer, thus not having the option to use Alt-Space or Ctrl-Space can be a hurdle to muscle memory.

[cronyakatsuki]

Today I installed zellij and tried to go ahead and bind ctrl + space as my prefix key to use it like how I use tmux, but because of this limitation it seems that zellij is going to be unused for me personally right now.

[lentil32]

(Ac hoc solution) In zellij, I binded something to "F11" and in terminal(Alacritty for me), mapped "Ctrl + Space" to "F11". it works

# alacritty.yml
- { key: Space, mods: Control, chars: "\x1b[23~" }