Retrieve available AI models for assistant configuration
llm - LLM models for the pipeline mode (default)multimodal - Multimodal models for the multimodal modedualplex - Multimodal models for the dualplex modetype parameter is provided, LLM models are returned by defaultllm_model_id field when creating pipeline assistantsmultimodal_model_id field when creating multimodal or dualplex assistants