cli: Allow for multiline prompt and visual processing feedback

[kiggundu]

Describe your changes

This PR address the following usability issues with the CLI

• It is now possible to paste text into prompt containing carriage returns. Before this reulted in
  individual lines being submitted making it imposible to include code examples in the prompt.
• An Ascii spinning whheel now provides visual feedback that processing is happening. Before it
  was not possible to tell whether the script was simply frozen for responses that take longer to produce.
• A robot icon to mark the responses. Before it was difficult to single out responses in long running conversations

Issue ticket number and link

Checklist before requesting a review

• [:heavy_check_mark: ] I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• [:heavy_check_mark: ] I have added thorough documentation for my code.
• [ ✔️ ] I have tagged PR with relevant project labels. I acknowledge that a PR without labels may be dismissed.
• If this PR addresses a bug, I have provided both a screenshot/video of the original bug and the working solution.

Demo

demo.mp4

Steps to Reproduce

Notes

[ThiloteE]

If it's UI related, please provide screenshots.

[kiggundu]

If it's UI related, please provide screenshots.

If it's UI related, please provide screenshots.

sure. have attached an mp4 of the modified cli and cleaned up the implementation further.

[cosmic-snow]

Sorry, I'm the wrong person to review this.