Support for rerank model through vercel ai sdk

[patelvivekdev]

Feature Description

Currently, we use embedding models from providers like Cohere and Mixedbread AI to build RAG. There are also re-rank models that can further enhance these systems.

However, to add a re-rank model while using the Vercel AI SDK, we have to manually set up API calls or use another SDK. To make this easier, support re-rank models directly in the Vercel AI SDK. This will allow developers to seamlessly integrate re-rank models and improve their language systems without extra hassle.

Use Case

https://www.mixedbread.ai/docs/reranking/overview

https://cohere.com/rerank

Additional context

As I did not find it in the docs, I am making a request. If an option is available and we can build it within this code base, I would appreciate it if someone could give me an example. So I can add it to the SDK.