Make it possible to take the input as an interactive prompt

Looks good, thanks. Do we need to update the docs for this? Seems intuitive enough to not really need mentioning 🤷

The other thing I'd like to have when entering drush ai is an interactive shell that continuously chats with you back and forth.

Thanks @ marcus_johansson → and @ robloach → ! The current implementation is intuitive and doesn’t require additional documentation. As noted, it would be great to explore the possibility of having an interactive shell mode for drush ai in future iterations — where it maintains a continuous back-and-forth chat experience.

I made a slight change in the order, so the interactive prompt doesn't show up if no default or set provider is set. Please rereview.

Reviewed the changes. Looks good to me. Tested scenarios:

1. Without any provider: got error "No default AI provider or model set" but 2 warnings:
   [warning] Trying to access array offset on null AiCommands.php:84
   [warning] Trying to access array offset on null AiCommands.php:85
2. Using invalid free tier key with openai provider. Input was accepted. Error: Unable to fetch response: Too Many Requests
3. Using valid key with Openai. Interactive prompt appeared, accepted input and output was displayed successfully.
4. Deleted the key from last step. Provider settings was kept the same as last step: Intercative prompt is displayed, accepted input from user, displayed "fetching Response.." and error: "Unable to fetch response: Error invoking model response: Could not load the OpenAI API key, please check your environment settings or your setup key."

I tried the following:

1. drush ai "what is Drupal?" It is showing "Fetching response..." as a loader.
2. drush ai showing interactive input and shows "Fetching response..." as a loader.
3. drush aiby default works for chat only, is it supposed to work for ai:translate-entity ai:translate-text also?

Hmm, perhaps something changed in the API. Thanks for the testing.