Built-in submit and stop buttons in `gr.ChatInterface(multimodal=False)`, adding `submit_btn` and `stop_btn` props to `gr.Textbox()` and `gr.MultimodalText()` (#9235)
* Add submit_btn prop to the Textbox component and use it in ChatInterface for a consistent design with multimodal=True
* Change the default value of MultimodalTextbox.submit_btn to False for consistency with Textbox.submit_btn
* add changeset
* Set the default value of Textbox.submit_btn as False for consistency
* add changeset
* Add stop_btn prop to Textbox and MultimodalTextbox and use it in ChatInterface for a built-in stop button
* add changeset
* add changeset
* Fix Python tests
* Fix JS tests
* nit fix
* Make the submit and stop buttons not exclusive for simplicity
* Replace the Pause icon with the Square icon
* add changeset
* Update the docstring
* Preserve the original values of textbox.submit_btn and .stop_btn after running a generator
* Show the stop button only when the submit_btn is enabled from the beginning
* Respect the user-specified values of submit_btn and stop_btn
* Add ChatInterface.submit_btn and .stop_btn params
* Fix Textbox.svelte style with string values of submit_btn and stop_btn
* Fix Python tests
* Fix Python code
* fix test
* Apply suggestions from code review
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>