[6/N][Refactor] torchair model runner refactor

[wangxiyuan]

There is lot of torchair code in model runner leading the code hard for maintenance. We'll create new torchair_model_runner to split torchair related logic. Following the workflow #2203

What's this PR do:

create common function _generate_process_reqs_hidden_states _generate_extra_builder_kwargs _update_input_ids_and_positions for prepare_reqs

• vLLM version: v0.10.0
• vLLM main: vllm-project/vllm@c494f96

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[github-actions]

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