feat: add option to use `code` instead `key` in defineShortcuts

[cany748]

Description

Currently defineShortcuts work only on English layout, adding this option will allow to use on any layout.

I'm ready to make a pr

Additional context

Similar:

if (shortcut.useCode ? e.code.toLowerCase() !== `key${shortcut.key}` : e.key.toLowerCase() !== shortcut.key) {
  continue;
}