transformers gguf mergekit merge llama-cpp gguf-my-repo base_model:mistralai/Mistral-7B-Instruct-v0.2 base_model:merge:mistralai/Mistral-7B-Instruct-v0.2 base_model:openchat/openchat-3.5-0106 base_model:merge:openchat/openchat-3.5-0106 endpoints_compatible region:us conversational