Adjust/checkbox radio styles

[djalmaaraujo]

Description

• [x] Update Radio label styles
• [x] Update Radio and Checkbox sizing and spaces
• [x] Make the brand color customizable from the theme

Checklist

• [ ] This PR has good automated test coverage
• [x] The storybook for the component has been updated

Steps to Test

1. Pull down PR.
2. npm run dev.
3. Open http://localhost:6006/?path=/story/form-radio--default
4. Radio updates: No bold font, 8px gap between radio and label, and only primary/success/brand/disabled states.
5. Open http://localhost:6006/?path=/docs/form-checkbox--docs
6. Checkbox updates: No bold font, 8px gap between radio and label, and only primary/success/brand/disabled states.

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