Add help text at Radio item

[luarakerlen]

Summary

I need to design a forms where radio items has a help text. My suggestion is to add this as optional prop, because I believe this can be useful for other applications.

Rationale

No response

[lucasaarcoverde]

You already can do this behavior using Field components, something like that:

<Field>
  <Radio value="daily">Daily</Radio>
  <FieldDescription>1 Row per day per entity</FieldDescription>
</Field>

But the design is a little bit different from the one you just sent here. @beatrizmilhomem @davicostalf can you take a look on this?

you can check on this sandbox for implementation details

[davicostalf]

Lua had asked me before and I had forgotten about the Field component. That answers it, I believe.

Regarding the layout, the label in this case was omitted because there's a form section dedicated for this field. This makes sense sometimes.