Add `c-live-region` component

[TylerAPfledderer]

Handles aria attributes that programmatically expose dynamic content changes for a screen reader to detect and read out.

See React package useLiveRegion

🚨 Important

The setup of the state in the React Package uses a class to construct an instance of the live controls for each component that will use it.

In this package, it will be created as a component with at least more flexibility for render.