Create a reusable widget for the carousel (OSOE-920)

[barthamark]

A SlickCarousel shape exists to display and configure a Slick Carousel element. Create a widget type that users can easily use to display a carousel on the website. An idea for the implementation:

• Create a widget content type called Slick Carousel.
• Create a Slide content type (initially it can contain a MediaField with a single image).
• Carousel type should have a part settings where the user can configure the Slick Carousel JSON.
• Each slide on the carouse should be the rendered display shape of the Slide content item.

Jira issue

[Piedone]

This could be in a new module, like Lombiq.UIKit.Widgets, but still in this repo.