Improve how `--list-models` , `--list-tools` and `--server` options are presented in `help` text.

[sangee2004]

It is confusing to see --list-models , --list-tools and --server as they are listed currently in the --help text when these commands do not operate on a PROGRAM_FILE . Is there a different way to present these options to the user in help ?

gptscript --help
Usage:
  gptscript [flags] PROGRAM_FILE [INPUT...]

Flags:
      --assemble                    Assemble tool to a single artifact, saved to --output ($GPTSCRIPT_ASSEMBLE)
      --cache                       Disable caching ($GPTSCRIPT_CACHE)
      --cache-dir string            Directory to store cache (default: $XDG_CACHE_HOME/gptscript) ($GPTSCRIPT_CACHE_DIR)
      --debug                       Enable debug logging ($GPTSCRIPT_DEBUG)
      --default-model string        Default LLM model to use ($GPTSCRIPT_DEFAULT_MODEL) (default "gpt-4-turbo-preview")
      --dump-state string           Dump the internal execution state to a file ($GPTSCRIPT_DUMP_STATE)
  -h, --help                        help for gptscript
  -f, --input string                Read input from a file ("-" for stdin) ($GPTSCRIPT_INPUT)
      --list-models                 List the models available and exit ($GPTSCRIPT_LIST_MODELS)
      --list-tools                  List built-in tools and exit ($GPTSCRIPT_LIST_TOOLS)
      --listen-address string       Server listen address ($GPTSCRIPT_LISTEN_ADDRESS) (default "127.0.0.1:9090")
      --openai-api-key string       OpenAI API KEY ($OPENAI_API_KEY)
      --openai-api-type string      OpenAI API Type (valid: OPEN_AI, AZURE, AZURE_AD) ($OPENAI_API_TYPE)
      --openai-api-version string   OpenAI API Version (for Azure) ($OPENAI_API_VERSION)
      --openai-base-url string      OpenAI base URL ($OPENAI_BASE_URL)
      --openai-org-id string        OpenAI organization ID ($OPENAI_ORG_ID)
  -o, --output string               Save output to a file, or - for stdout ($GPTSCRIPT_OUTPUT)
  -q, --quiet                       No output logging (set --quiet=false to force on even when there is no TTY) ($GPTSCRIPT_QUIET)
      --server                      Start server ($GPTSCRIPT_SERVER)
      --sub-tool string             Use tool of this name, not the first tool in file ($GPTSCRIPT_SUB_TOOL)
  -v, --version                     version for gptscript