fix(radio-button-group): strongly type dispatched change/select events

[metonym]

Strongly type the event.detail as string for RadioButtonGroup and TileGroup. Currently, it defaults to any since the type is not explicitly annotated.

<RadioButtonGroup
  legendText="Storage tier (disk)"
  selected="standard"
  on:change="{(e) => {
    console.log(e.detail); // string
  }}"
/>

[metonym]

Fixed in v0.81.0