Update request structure to include assistant message (and update block config form to reflect this).
- Updates the request structure to have 3 messages:
- The system message (configurable in the block)
- The assistant message (configurable in block and also contains a [context] token).
- The user message (configurable in block and contains a [user-prompt] token for the user's prompt.)
- Updates the help text for a number of fields on the ChatFormBlock.
- Updates the default values for top_k and max_length.
- Fixes the visible default value for temperature and max tokens.
- Make index field required.
Edited by Mark Jones