feature: cluster selection color

[micksabox]

I needed a way to display the cluster selection state. In this case I just added two properties:

    selectedClusterId?: string;
    selectedClusterColor?: string;

which are compared in the markers.map iterator and dynamically sets the color of the marker. To implement, onClusterPress(cluster), save the cluster.id to component state and pass as a prop to the MapView.

[venits]

I implemented those changes in 3.4.0 version of library.

Thank you so much for contributing 💕