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.

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