[XPU] xpu support mm prefill batch

[ddchenhao66]

Motivation

xpu支持多模模型的多batch prefill，允许一次推理过程可以有多个query同时在做prefill。

Modifications

• config中打开MAX_PREFILL_NUM限制；
• 调度中打开多batch prefill限制；
• xpu_model_runner修改多模组batch逻辑；

Checklist

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Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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