Provide collection based methods for HasComponents

[stefanuebe]

Describe your motivation

Currently it is not simply possible to add/remove a collection of components to/from another component. It first has to be converted to an array. That feels clumsy and incomplete.

Describe the solution you'd like

Provide new, collection based add and remove methods to HasComponents which do the same as the varargs variants, e.g.

public interface HasComponents extends HasElement, HasEnabled { 
    default void add(Collection<Component> components) {
        Objects.requireNonNull(components, "Components should not be null");
        for (Component component : components) {
            Objects.requireNonNull(component,
                    "Component to add cannot be null");
            getElement().appendChild(component.getElement());
        }
    }

    // analog for remove(Collection<Component> components)
}

[vaadin-bot]

This ticket/PR has been released with Vaadin 23.2.0.beta1 and is also targeting the upcoming stable 23.2.0 version.