Add command_palette command to display bound keys

Add a Go-based command_palette kitten that provides a searchable,
interactive overlay for browsing and triggering keyboard shortcuts
and actions.

- New Go kitten at kittens/command_palette/ with FZF fuzzy search,
  grouped/flat views, and remote control action triggering
- Python collect_keys_data() does data collection, passed via stdin
- Navigation: arrows, ctrl+j/k (vim), ctrl+n/p (emacs), page up/down
- Enter triggers the selected action via RC command
- Help text displayed in footer for selected binding
- Added Go tests (main_test.go) and Python tests (command_palette.py)

tools/cmd/tool/main.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/kovidgoyal/kitty/kittens/ask"
 	"github.com/kovidgoyal/kitty/kittens/choose_files"
+	"github.com/kovidgoyal/kitty/kittens/command_palette"
 	"github.com/kovidgoyal/kitty/kittens/choose_fonts"
 	"github.com/kovidgoyal/kitty/kittens/clipboard"
 	"github.com/kovidgoyal/kitty/kittens/desktop_ui"
@@ -97,6 +98,8 @@ func KittyToolEntryPoints(root *cli.Command) {
 	choose_fonts.EntryPoint(root)
 	// choose-files
 	choose_files.EntryPoint(root)
+	// command-palette
+	command_palette.EntryPoint(root)
 	// query-terminal
 	query_terminal.EntryPoint(root)
 	// __pytest__