Add new carousel widget container

[ecarreras]

This pull request introduces a new Carousel widget to the codebase, along with the necessary integration and tests. The main changes include the implementation of the Carousel class, updates to the WidgetFactory to support the new widget, and the addition of tests to ensure the Carousel functions correctly.

Implementation of Carousel widget:

• src/Carousel.ts: Added the Carousel class, which extends ContainerWidget and includes properties and methods for autoPlay and items. The constructor allows setting autoPlay via properties.

Integration with WidgetFactory:

• src/WidgetFactory.ts: Imported the Carousel class and updated the WidgetFactory to create a Carousel widget when the type is "carousel". [1] [2]

Exporting the Carousel widget:

• src/index.ts: Imported and exported the Carousel class to make it available for use in other parts of the application. [1] [2]

Testing the Carousel widget:

• src/spec/Carousel.spec.ts: Added tests for the Carousel widget to verify its creation, default autoPlay value, ability to set autoPlay, and correct handling of items within groups.