Function RadioGroup

RadioGroup(__namedParameters: RadioGroupProps): Element
A labelled group of Radios. Renders a <fieldset> and <legend>, shares one name, and tracks the selected value. Radios inside don't need name or checked.
Parameters
- __namedParameters: RadioGroupProps
Returns Element
Example
```
<RadioGroup label="Plan" defaultValue="pro" orientation="horizontal">
  <Radio value="free">Free</Radio>
  <Radio value="pro">Pro</Radio>
</RadioGroup>
```