[WIP] Add SGLang Support

[pjyi2147]

Pull Request Checklist

Reference Issue

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ref: N/A

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• [x] Have you followed the contributing guidelines?
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• [ ] Have you updated any relevant documentation or added new tests where needed?

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation content changes
• [ ] Other...
  • Description:

Instructions:

1. Install SGLang locally from pjyi2147:SGLang with pip install -e .[all].
2. Install rank_llm locally with pip install -e .[sglang].
3. Use command to run RankZephyr on SGLang

python src/rank_llm/scripts/run_rank_llm.py  --model_path=castorini/rank_zephyr_7b_v1_full --top_k_candidates=100 --dataset=dl19 --retrieval_method=SPLADE++_EnsembleDistil_ONNX --prompt_mode=rank_GPT  --context_size=4096 --variable_passages --window_size=20 --sglang_batched