Add "hyprctl submap --current/--list" so bars can restore submap state

[dillacorn]

Request:
Add a command such as:

• hyprctl submap --current to print the active submap
  and/or
• hyprctl submap --list to show known submaps

Why:
Waybar’s hyprland/submap module only reacts to live events. When Waybar is restarted (hypridle turns it off, or I reload it), it has no way to ask Hyprland “which submap are you in right now?”, so the indicator is empty/wrong.

Examples:
I restart Waybar with:

$waybar_toggle = sh -c 'if pgrep -x waybar >/dev/null; then pkill -x waybar && echo waybar_not_running > /tmp/waybar.state; else (waybar & echo waybar_running > /tmp/waybar.state); fi'

I also move the bar top/bottom, which restarts Waybar:

$waybar_top-or-bottom = sh -c 'cfg="$HOME/.config/waybar/config"; if grep -q "\"position\": \"top\"" "$cfg"; then sed -i "s/\"position\": \"top\"/\"position\": \"bottom\"/" "$cfg"; else sed -i "s/\"position\": \"bottom\"/\"position\": \"top\"/" "$cfg"; fi && pkill -x waybar 2>/dev/null; waybar >/dev/null 2>&1 &'

Both cases lose the submap indicator. A callable hyprctl submap --current would let bars restore it on startup without custom scripts.

[dillacorn]

#2641

I was able to solve this with a custom/hypr-submap in waybar config.

It's not instantaneous but so much better than before.

https://github.com/dillacorn/awtarchy/blob/main/config/hypr/hyprland.conf

https://github.com/dillacorn/awtarchy/blob/main/config/waybar/config

I don't want to mark as solved because it's technically slower than if hyprland had a command such as "hyprctl submap --print-current" or however vaxry would prefer it.