Conversation messages refactor add msg ids

[danielpatrickhug]

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• in oasst_shared/schemas/protocal.py I modified ConversationMessage adding the variable message_id and frontend_message_id
• in backend/oasst_backend/api/v1 I modified instances of ConversationMessage in tasks.py and utils.py to include the new variable when instantiating ConversationMessage
• in backend main.py I updated the instantiation of conversation message to include message_id and frontend_id
• Ran pre-commit to format