Add support for returning multiple messages from `gr.ChatInterface` chat function (#10197)
* multiple messages
* filepath
* add changeset
* changes
* changes
* changes
* changes
* changes
* changes
* changes
* changes
* add test
* add changeset
* changes
* add a lot more tests
* changes
* chat
* change
* changes
* chat
* changes
* change demo
* remove test
* changes
* format
* fix
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