[firestore-genai-chatbot] Allow regenerating response without changing the prompt

[Peetee06]

[READ] Step 1: Are you in the right place?

Issues filed here should be about a feature request for a specific extension in this repository. To file a feature request that affects multiple extensions or the Firebase Extensions platform, please reach out to
Firebase support directly.

[REQUIRED] Step 2: Extension name

This feature request is for extension: firestore-genai-chatbot

What feature would you like to see?

It would be great to be able to regenerate a response without having to change the prompt.

How would you use it?

I'm processing the generated response in my code, so it needs to be in a specific format. In some cases the response does not adhere to that format. In these cases I would like to be able to retry with the same prompt.

The current implementation requires me to change the state field, as well as changing the prompt in order to regenerate a response.