fix(radio-group): add value to interface and prop types

Radio Group was inheriting the interface from inline control group
which doesn't actually use value. So explicitly declare value just for
Radio Group

.changeset/nervous-moles-sleep.md

@@ -0,0 +1,5 @@
+---
+'@twilio-paste/radio-group': patch
+---
+
+Value is added as a prop used specifically by RadioGroup as it was inheriting its prop interface from InlineContorlGroup which doens't use value at all.

packages/paste-core/components/radio-group/src/RadioGroup.tsx

@@ -7,6 +7,7 @@ import {RadioContext} from './RadioContext';
 export interface RadioGroupProps extends InlineControlGroupProps {
   name: string;
   onChange: (value: string) => void;
+  value?: string;
 }
 
 const RadioGroup = React.forwardRef<HTMLFieldSetElement, RadioGroupProps>(
@@ -45,6 +46,7 @@ if (process.env.NODE_ENV === 'development') {
   RadioGroup.propTypes = {
     name: PropTypes.string.isRequired,
     onChange: PropTypes.func.isRequired,
+    value: PropTypes.string,
   };
 }