feat: add prompt-format list

[reidliu41]

What does this PR do?

[Provide a short summary of what this PR does and why. Link to relevant issues if applicable.]

llama-stack/llama_stack/cli/model/prompt_format.py

Line 47 in 19ae4b3

# Only Llama 3.1 and 3.2 are supported

Based on the comment: Only Llama 3.1 and 3.2 are supported, even 3.1, 3.2 are not all models can show it with prompt-format, so cannot refer to llama model list,
only refer to list when enter a invalid model, so it would be nice to help to check the valid models:

 llama model prompt-format -m Llama3.1-405B-Instruct:bf16-mp8
usage: llama model prompt-format [-h] [-m MODEL_NAME] [-l]
llama model prompt-format: error: Llama3.1-405B-Instruct:bf16-mp8 is not a valid Model <<<<---. Choose one from --
Llama3.1-8B
Llama3.1-70B
Llama3.1-405B
Llama3.1-8B-Instruct
Llama3.1-70B-Instruct
Llama3.1-405B-Instruct
Llama3.2-1B
Llama3.2-3B
Llama3.2-1B-Instruct
Llama3.2-3B-Instruct
Llama3.2-11B-Vision
Llama3.2-90B-Vision
Llama3.2-11B-Vision-Instruct
Llama3.2-90B-Vision-Instruct

before:
$ llama model prompt-format --help
usage: llama model prompt-format [-h] [-m MODEL_NAME]

Show llama model message formats

options:
  -h, --help            show this help message and exit
  -m MODEL_NAME, --model-name MODEL_NAME
                        Model Family (llama3_1, llama3_X, etc.)

Example:
    llama model prompt-format <options>


after:
$ llama model prompt-format --help
usage: llama model prompt-format [-h] [-m MODEL_NAME] [-l]

Show llama model message formats

options:
  -h, --help            show this help message and exit
  -m MODEL_NAME, --model-name MODEL_NAME
                        Model Family (llama3_1, llama3_X, etc.)
  -l, --list            List the valid supported models

Example:
    llama model prompt-format <options>

$ llama model prompt-format -l
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Model                        ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ Llama3.1-8B                  │
├──────────────────────────────┤
│ Llama3.1-70B                 │
├──────────────────────────────┤
│ Llama3.1-405B                │
├──────────────────────────────┤
│ Llama3.1-8B-Instruct         │
├──────────────────────────────┤
│ Llama3.1-70B-Instruct        │
├──────────────────────────────┤
│ Llama3.1-405B-Instruct       │
├──────────────────────────────┤
│ Llama3.2-1B                  │
├──────────────────────────────┤
│ Llama3.2-3B                  │
├──────────────────────────────┤
│ Llama3.2-1B-Instruct         │
├──────────────────────────────┤
│ Llama3.2-3B-Instruct         │
├──────────────────────────────┤
│ Llama3.2-11B-Vision          │
├──────────────────────────────┤
│ Llama3.2-90B-Vision          │
├──────────────────────────────┤
│ Llama3.2-11B-Vision-Instruct │
├──────────────────────────────┤
│ Llama3.2-90B-Vision-Instruct │
└──────────────────────────────┘

Test Plan

[Describe the tests you ran to verify your changes with result summaries. Provide clear instructions so the plan can be easily re-executed.]

[leseb]

Suggested change

	headers = ["Model"]
	headers = ["Model(s)"]