Cleaning up --help: Artifact Management Subcommands

[Jack-Khuu]

The current --help is a mess; it uses a giant add_arguments_for_verb function that doesn't actually filter based on the provided verb subcommand.

This PR is part of a series to clean up this behavior.

Specifically, this PR separates out and defines the arg closure for artifact management subcommands (download, list, remove, where). These subcommands are sufficiently different from the other commands, so it makes things cleaner to special case them out.

Note that I was very verbose in listing the conditionals for legibility

---

python3 torchchat.py download --help

usage: torchchat download [-h] [--model-directory MODEL_DIRECTORY] [--hf-token HF_TOKEN] [model]

positional arguments:
  model                 Model name for well-known models

options:
  -h, --help            show this help message and exit
  --model-directory MODEL_DIRECTORY
                        The directory to store downloaded model artifacts. Default: /Users/jackkhuu/.torchchat/model-cache
  --hf-token HF_TOKEN   A HuggingFace API token to use when downloading model artifacts

python3 torchchat.py list --help

usage: torchchat list [-h] [--model-directory MODEL_DIRECTORY]

options:
  -h, --help            show this help message and exit
  --model-directory MODEL_DIRECTORY
                        The directory to store downloaded model artifacts. Default: /Users/jackkhuu/.torchchat/model-cache

python3 torchchat.py remove --help

usage: torchchat remove [-h] [--model-directory MODEL_DIRECTORY] [model]

positional arguments:
  model                 Model name for well-known models

options:
  -h, --help            show this help message and exit
  --model-directory MODEL_DIRECTORY
                        The directory to store downloaded model artifacts. Default: /Users/jackkhuu/.torchchat/model-cache

python3 torchchat.py where --help

usage: torchchat where [-h] [--model-directory MODEL_DIRECTORY] [model]

positional arguments:
  model                 Model name for well-known models

options:
  -h, --help            show this help message and exit
  --model-directory MODEL_DIRECTORY
                        The directory to store downloaded model artifacts. Default: /Users/jackkhuu/.torchchat/model-cache

[pytorch-bot]

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