Add support for ```/rerank``` API for NVIDIA Inference Provider

[jiayin-nvidia]

🚀 Describe the new functionality needed

• Add support for the /rerank API for NVIDIA Inference Provider.

💡 Why is this needed? What if we don't build it?

• This allows Llama Stack users to use rerank NIMs, for example nvidia/llama-3_2-nv-rerankqa-1b-v2.

Other thoughts

No response

[jiayin-nvidia]

Hi @franciscojavierarceo could you please assign this issue to me? Thank you!

[franciscojavierarceo]

done!

[github-actions]

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