Clustering support

[Sovetnikov]

Clustering support for overlay layer

app.overlay_layer(
    data=df,
    name="Buildings",
    description="Buildings",
    style={"fillColor": "#F87979", "clustered": True, "clusterDisableClusteringAtZoom": 14},
    visible=True,
)

[krish-adi]

Haven't had the time to review this. Will do it in the next few days. Thanks for the PR @Sovetnikov