[Request]: UX: add whitespace between subcommand groups for `container --help`.

[jglogan]

Feature or enhancement request details

Help would be a bit more readable with whitespace between groups.

We should look into whether there's any way to do this with swift-argument-parser config; otherwise, Application.printModifiedHelpText() where we could regex replace before adding plugin subcommands with pluginLoader.alterCLIHelpText().

OVERVIEW: A container platform for macOS
USAGE: container [--debug] <subcommand>
OPTIONS:
  --debug                 Enable debug output [environment: CONTAINER_DEBUG]
  --version               Show the version.
  -h, --help              Show help information.

CONTAINER SUBCOMMANDS:
  create                  Create a new container
  delete, rm              Delete one or more containers
  exec                    Run a new command in a running container
  export                  Export a container's filesystem as a tar archive
  inspect                 Display information about one or more containers
  kill                    Kill or signal one or more running containers
  list, ls                List running containers
  logs                    Fetch container logs
  run                     Run a container
  start                   Start a container
  stats                   Display resource usage statistics for containers
  stop                    Stop one or more running containers
  prune                   Remove all stopped containers

IMAGE SUBCOMMANDS:
  build                   Build an image from a Dockerfile or Containerfile
  image, i                Manage images
  registry, r             Manage registry logins

VOLUME SUBCOMMANDS:
  volume, v               Manage container volumes

OTHER SUBCOMMANDS:
  builder                 Manage an image builder instance
  network, n              Manage container networks
  system, s               Manage system components

Code of Conduct

• I agree to follow this project's Code of Conduct