Hyper key / arbitrary xkb symbol support

[jabcross]

Linux (both X11 and Wayland) is very customizable and actually support many more modifiers than just shift, ctrl, alt and super. For instance, one could separate Alt and Meta into separate modifiers. Also, there is the Hyper key, to which some people bind Caps Lock, and that is easily accessible in Gnome Tweaks for instance.

(For disambiguation, I'm not talking about the "everything at once" modifier that some keyboards provide. It's a separate, independent modifier that can be used alone or in combination with others.)

These names, however, are just default conventions. By modifying xkb configuration, you can rename any key however you want. In place of asking for support for the Hyper key in particular, I'd like to ask for the ability to just address the xkb symbols by their names in the keybinds config, as Zed receives them from Wayland/X11. So, instead of something like "super-x" I could write <Hyper_L>-x.