feat: document question and answer (DocQnA)

[ceberam]

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[PeterStaar-IBM]

@ceberam Good start, but I would like to have support directly for multi-turn conversations with different roles,

messages = [
    {"role": "system", "content": "You are a helpful assistant."},
    {"role": "user", "content": "What's the weather like today?"},
    {"role": "assistant", "content": "Today's weather is sunny with a high of 25°C."}
]

Can we replace the QA class with a MessageItem (single line) and the ConversationItem with be a list of MessageItem. We also need an enum for role, and MessageLabel.