[OpenAI-API-compatible] add chat_template_kwargs input to the setting panel of llm node

[yimlin]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

bg: #2468

I totally agree with Dosu

what if our agent engineer can input the special chat_template_kwargs at the setting panel of llm node, it can help we apply non-standard parameters of some models.

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.