Language independent hotkeys (#34053)

Addresses #10972 
Closes #24950
Closes #24499

Adds _key_en_ to _Keystroke_ that is derived from key's scan code. This
is more lightweight approach than #32529

Currently has been tested on x11 and windows. Mac code hasn't been
implemented yet.

Release Notes:

- linux: When typing non-ASCII keys on Linux we will now also match
keybindings against the QWERTY-equivalent layout. This should allow most
of Zed's builtin shortcuts to work out of the box on most keyboard
layouts. **Breaking change**: If you had been using `keysym` names in
your keyboard shortcut file (`ctrl-cyrillic_yeru`, etc.) you should now
use the QWERTY-equivalent characters instead.

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/gpui/src/platform/keystroke.rs

@@ -13,6 +13,9 @@ pub struct Keystroke {
 
     /// key is the character printed on the key that was pressed
     /// e.g. for option-s, key is "s"
+    /// On layouts that do not have ascii keys (e.g. Thai)
+    /// this will be the ASCII-equivalent character (q instead of ๆ),
+    /// and the typed character will be present in key_char.
     pub key: String,
 
     /// key_char is the character that could have been typed when