[bug]: RadioGroup cannot pass a disabled attribute to the Radio component

[mikhaelbois]

Describe the bug
When using the RadioGroup component, we cannot specify if its items are disabled or not.

https://github.com/magento/pwa-studio/blob/develop/packages/venia-ui/lib/components/RadioGroup/radioGroup.js#L34
In the RadioGroup component, the items only accepts a label and a value.

Expected behavior
We should have a way to render the Radio items as disabled or not.

Possible solutions
We could pass additional attributes to the item via an attributes key of the items prop.

const options = items.map(({ label, value, attributes }) => (
    <Radio
        classes={{
            label: classes.radioLabel,
            root: classes.radio
        }}
        key={value}
        label={label}
        value={value}
        {...attributes}
    />
));

/* --- */

const items = [
    { label: 'Enabled item', value: 'value_1' },
    {
        label: 'Disabled item',
        value: 'value_2',
        attributes: { disabled: true }
    }
];

/* --- */

<RadioGroup
    field="disabled_example"
    items={items}
/>

Please complete the following device information:

• Magento Version: 2.3.4
• PWA Studio Version: 5.0.1
• NPM version: 6.11.3
• Node Version: 10.17.0

Please let us know what packages this bug is in regards to:

• venia-concept
• venia-ui
• pwa-buildpack
• peregrine
• pwa-devdocs
• upward-js
• upward-spec
• create-pwa

[awilcoxa]

Good value add and relatively low LOE, moving to prioritized for pickup by interested community member(s)