Deprecation notice for @atlaskit/media-viewer dataSource

The property dataSource in the interface MediaViewerProps is deprecated in @atlaskit/media-viewer@47.5.0 The optional pageSize property is also no longer supported without a workaround.
dataSource can no longer accept a collection name. From now, only a list of files will be allowed. Hence pageSize is also no longer accepted.
Consumers using collectionName as the dataSource should prepare the list of files contained in their collection and pass it through the new items property