Refactor existing components to use the new Component class

[romaricpascal]

What

Refactor the existing components to use the base Component class introduced by alphagov/govuk-frontend#5327.

This should be done ahead of its release, by publishing a preview for the public-js-api branch.

Why

As a way to use the features we offer in GOV.UK Frontend, as way to test what we'll offer in GOV.UK Frontend before the release, as well as measure any impact on the final bundle (hopefully in the shape of a small file size reduction due to code being shared in the base Component class

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• We've created a preview of GOV.UK Frontend's public-js-api branch
• We've create a branch of the Design System site using that preview
• We've refactor the components of the Design System site to use the base Component class where possible
• We've reviewed the impacts of the refactoring