Add 'gguf' to project dependencies

[Muqi1029]

Motivation

After installing sglang:v0.5.4

/root/.envs/dev/lib/python3.12/site-packages/torch/cuda/__init__.py:63: FutureWarning: The pynvml package is 
deprecated. Please install nvidia-ml-py instead. If you did not install pynvml directly, please report this t
o the maintainers of the package that installed pynvml for you.
  import pynvml  # type: ignore[import]
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/root/projects/dev_project/sglang/python/sglang/launch_server.py", line 11, in <module>
    server_args = prepare_server_args(sys.argv[1:])
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/projects/dev_project/sglang/python/sglang/srt/server_args.py", line 3689, in prepare_server_arg
s
    return ServerArgs.from_cli_args(raw_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/projects/dev_project/sglang/python/sglang/srt/server_args.py", line 3339, in from_cli_args
    return cls(**{attr: getattr(args, attr) for attr in attrs})
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<string>", line 268, in __init__
  File "/root/projects/dev_project/sglang/python/sglang/srt/server_args.py", line 544, in __post_init__
    self._handle_gpu_memory_settings(gpu_mem)
  File "/root/projects/dev_project/sglang/python/sglang/srt/server_args.py", line 805, in _handle_gpu_memory_
settings
    from sglang.srt.configs.model_config import ModelConfig
  File "/root/projects/dev_project/sglang/python/sglang/srt/configs/model_config.py", line 26, in <module>
    from sglang.srt.layers.quantization import QUANTIZATION_METHODS
  File "/root/projects/dev_project/sglang/python/sglang/srt/layers/quantization/__init__.py", line 45, in <mo
dule>
    from sglang.srt.layers.quantization.gguf import GGUFConfig
  File "/root/projects/dev_project/sglang/python/sglang/srt/layers/quantization/gguf.py", line 9, in <module>
    import gguf
ModuleNotFoundError: No module named 'gguf'

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

[gemini-code-assist]

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