Allow optionally showing unmapped actions in the command palette

Also highlight letters matching the search query.
Fixes #9589

kitty/options/utils.py

@@ -167,6 +167,7 @@ def detach_tab_parse(func: str, rest: str) -> FuncArgsType:
 @func_with_args(
     'set_background_opacity', 'goto_layout', 'toggle_layout', 'toggle_tab', 'kitty_shell', 'show_kitty_doc',
     'set_tab_title', 'push_keyboard_mode', 'dump_lines_with_attrs', 'set_window_title', 'simulate_color_scheme_preference_change',
+    'command_palette',
 )
 def simple_parse(func: str, rest: str) -> FuncArgsType:
     return func, (rest,)