gr.load_chat supports optional textbox= argument (#11998)
* gr.load_chat supports optional textbox= argument
* Fix test
* add changeset
* Fix
* add changeset
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Co-authored-by: Freddy Boulton <41651716+freddyaboulton@users.noreply.github.com>
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
