Unify methods from the ClusterRendererMultipleItems into ClusterRenderer

[kikoso]

The PR implementing ClusterRendererMultipleItems adds methods for managing animations in a renderer.

These changes were applied to ClusterRendererMultipleItems instead of ClusterRenderer to avoid introducing a breaking change.

Once the feature has been sufficiently tested and deemed stable, these methods could be moved to the base ClusterRenderer to extend this functionality to all renderers.