vaadin / vaadin-radio-button / 1475

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feat: add helper text API (#153)

* feat: add helper text

- Add helper text to `vaadin-radio-group` as string attribute and
 name slotted

 Part of #149

* doc: add demo of helper text and theme

* test: add unit and visual tests

* refactor: change private method name and body

* refactor: align with checkbox helper text changes

* fix: remove check for unsupported type

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