`st.chat_input` doesn't support "new line" btn on the keyboard

[el-ibrahim-mohamed]

Checklist

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Summary

When typing text in st.chat_input, it should support the new line keyboard button instead of the "enter" button.

Why?

This will help users make new lines and prevent accidental submissions in mobile use.

How?

Maybe a parameter to use the "new line" button instead or always use it

Additional Context

This would be like st.text_area

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