`BadgeIndicator` component for icon-only button

[metonym]

The React version has a badge indicator to symbolize notifications. It seems it can be used with icon-only buttons, with a primary use case being in the UI Shell (e.g., notification center).

https://github.com/carbon-design-system/carbon/blob/main/packages/styles/scss/components/badge-indicator/_badge-indicator.scss
https://react.carbondesignsystem.com/?path=/story/components-iconbutton--with-badge-indicator

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