Ngff follow ups

[thewtex]

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[bnmajor]

@thewtex When I try to run either the 3DImage or DaskArray notebooks I get the following error:

Traceback (most recent call last):
  File "/home/local/KHQ/brianna.major/.virtualenvs/clean-itkwidgets/lib/python3.8/site-packages/imjoy_rpc/rpc.py", line 404, in _wait
    result = await result
  File "/home/local/KHQ/brianna.major/itkwidgets/itkwidgets/viewer.py", line 87, in run
    result = _get_viewer_image(data, label=False)
  File "/home/local/KHQ/brianna.major/itkwidgets/itkwidgets/integrations/__init__.py", line 83, in _get_viewer_image
    multiscales = to_multiscales(ngff_image, method=method)
  File "/home/local/KHQ/brianna.major/.virtualenvs/clean-itkwidgets/lib/python3.8/site-packages/ngff_zarr/to_multiscales.py", line 109, in to_multiscales
    images = _downsample_dask_image(
  File "/home/local/KHQ/brianna.major/.virtualenvs/clean-itkwidgets/lib/python3.8/site-packages/ngff_zarr/methods/_dask_image.py", line 110, in _downsample_dask_image
    previous_image = _align_chunks(previous_image, default_chunks, dim_factors)
  File "/home/local/KHQ/brianna.major/.virtualenvs/clean-itkwidgets/lib/python3.8/site-packages/ngff_zarr/methods/_support.py", line 27, in _align_chunks
    previous_image.data = previous_image.data.chunk(aligned_chunks)
AttributeError: 'Array' object has no attribute 'chunk'

Edit: Just noting that this happens in transform_visualization and vtkImageData as well.

[thewtex]

@bnmajor thanks for testing, addressed in ebfcd8e

[bnmajor]

Thanks, looking great!