Add support for FlatGeoBuf layers in MetadataExplorer

[stefanocudini]

• upgrade MapStore include FlatGeobuf 11749
• adapt resource FlatGeobuf as Geonode datasets (MS don’t have)
• upgrade UploadPanel components for loading remote FlatGeobuf file https://github.com/GeoNode/geonode-mapstore-client/blob/master/geonode_mapstore_client/client/js/routes/UploadDataset.jsx#L89