segmented_control with a required value

[RubenVanEldik]

Checklist

• [X] I have searched the existing issues for similar feature requests.
• [X] I added a descriptive title and summary to this issue.

Summary

Hi all,

The segmented_control component is a fantastic new component that I think will be used a lot by Streamlit users.

However, I currently miss 1 option, that is to require a value. For example, now it is possible to provide a default value which can be unclicked.

Why?

In many use cases where segmented_control will be used in a single mode, the developer might want to force the user to select something.

How?

I propose to expand the segmented_control (and pills) API by adding an extra parameter 'required' . If required is True, a value must always be selected.

options = ["North", "East", "South", "West"]
selection = st.segmented_control(
    "Directions",
    options,
    selection_mode="single",
    required=True,
    default="South",
)

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[jrieke]

Somewhat related: #7165