Give admins a greater control over the prompt sent to ChatGPT

The current prompt is hardcoded. This doesn't give people much control over what is sent to ChatGPT and doesn't give much room for experimentation.

- Make it so that the block has an advanced configuration for what the prompt that is sent to chatgpt is.
- Make it similar to the views_chatgpt but with a few hard-coded tokens [user-prompt] - [context]. Where user prompt is what the user has typed verbatim and the context is what is passed from pinecone.
- Make it so the debug page shows the prompt that will be used.

- If we do message history, make it so that outputs the exact prompt used for each message.