Constructs the ConfigSnapshotSubscriber object.
StorageInterface $source_storage: The source storage used to discover configuration changes.
StorageInterface $snapshot_storage: The snapshot storage used to write configuration changes.
public function __construct(StorageInterface $source_storage, StorageInterface $snapshot_storage) {
$this->sourceStorage = $source_storage;
$this->snapshotStorage = $snapshot_storage;
}