Support passing a list of message to LLM model

[zjffdu]

Is your feature request related to a problem? Please describe. Currently I can only pass one string to Generator, but openai support a list of message which is what I want.

Describe the solution you'd like I'd like to support a list of messages like following:

messages = [
    {"role": "system", "content": "You are a helpful assistant."},
    {"role": "user", "content": "Who won the World Series in 2020?"},
    {"role": "assistant", "content": "The Los Angeles Dodgers won the World Series in 2020."},
    {"role": "user", "content": "Who was the MVP?"},
]

# Call the ChatCompletion.create method with the messages
response = openai.ChatCompletion.create(
    model="gpt-4",  # Use "gpt-4" or "gpt-3.5-turbo" depending on your model availability
    messages=messages
)

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.