Adjust link and menu

[djalmaaraujo]

Description

• Link: Adjust the link textUnderlineOffset css style
• Menu: Add activeChildren to NavItem.MenuGroup so both can be active but with a different style

Checklist

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

Steps to Test

1. Open http://localhost:6006/?path=/story/navigation-nav--menu
2. Logs should be active (visually) when you close it
3. Logs should be inactive (visually) when you open and there's an active child

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