`PillButtonBar` is a horizontal scrollable list of pill-shaped text buttons in which only one button can be selected at a given time.

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<img className="off" src="https://static2.sharepointonline.com/files/fabric/fabric-website/images/controls/ios/updated/img_pillbar_01_light.png?text=LightMode" />
<img className="on" src="https://static2.sharepointonline.com/files/fabric/fabric-website/images/controls/ios/updated/img_pillbar_01_dark.png?text=DarkMode" />

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