Add active window-aware, app-specific keybindings lookup table

[giovesch]

It would be useful to have a keybinding lookup table that is context-aware, i.e., it shows app-specific keybindings depending on the currently focused window.

For example, preinstalled apps like Chromium, OBS, Alacritty, and Obsidian, could each have their own keybinding table.
SUPER + SHIFT + K shortcut could be used to trigger this lookup.

The command hyprctl activewindow can be used to detect the currently focused application and display the appropriate table.

The user should be able to create his own tables and link them to a specific app relatively easy in a dotfile.
This would improve usability and it would help with learning applications shortcuts.

p.s. I moved the post from Issues to Ideas, my bad, sorry for the double posting.