Extend endpointOai.ts to allow usage of extra sampling parameters (#1032)
* Extend endpointOai.ts to allow usage of extra sampling parameters when calling vllm as an OpenAI compatible
* refactor : prettier endpointOai.ts
* Fix: Corrected type imports in endpointOai.ts
* Simplifies code a bit and adds `extraBody` to open ai endpooint
* Update zod schema to allow any type in extraBody
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Co-authored-by: Nathan Sarrazin <sarrazin.nathan@gmail.com>