localectl: convert to the new option and verb parsers

localectl: convert to the new option and verb parsers

The verb synopses are long, so they got broken up:
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> localectl [OPTIONS…] COMMAND …

Query or change system locale and keyboard settings.

Commands:
  [status]                      Show current locale settings
  set-locale LOCALE...          Set system locale
  list-locales                  Show known locales
  set-keymap MAP [MAP]          Set console and X11 keyboard mappings
  list-keymaps                  Show known virtual console keyboard mappings
  set-x11-keymap LAYOUT [MODEL  Set X11 and console keyboard mappings
    [VARIANT [OPTIONS]]]
  list-x11-keymap-models        Show known X11 keyboard mapping models
  list-x11-keymap-layouts       Show known X11 keyboard mapping layouts
  list-x11-keymap-variants      Show known X11 keyboard mapping variants
    [LAYOUT]
  list-x11-keymap-options       Show known X11 keyboard mapping options

Options:
  -h --help                     Show this help
     --version                  Show package version
  -l --full                     Do not ellipsize output
     --no-pager                 Do not start a pager
     --no-ask-password          Do not prompt for password
  -H --host=[USER@]HOST         Operate on remote host
  -M --machine=CONTAINER        Operate on local container
     --no-convert               Don't convert keyboard mappings

See the localectl(1) man page for details.
===============================================================================

But I think this is OK. Everything is readable. On a more normal terminal,
everything fits nicely.

Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>