Support for loading images as a stack

[MosGeo]

Use Case

I thought to open this issue to discuss. napari-aicsimageio does not support open folder right now. It would be good if it supported it.

Solution

Here is a possible implementation. Some notes:

1. I am using AICSImage. As I understand it, napari-aicsimageio now uses the raw reader data.
2. I am using the dask interface.
3. I am saving the filenames in the meta data. This is useful for my plugins.
4. The metadata aicsimage is still aicsimage and not aicsimages. Again, I like standardization. But in this case, it is returning a list of images.

def load_image_stacks_to_viewer(viewer:napari.Viewer, filenames:list[Path])->None:
    """Loads image stack"""
    # Stopping condition
    if len(filenames)==0:
        return None

    # Load images
    images:list[AICSImage] = []
    for filename in filenames:
        image = AICSImage(filename)
        images.append(image)

    # Stopping condition - Check sizes
    reference_image_size = images[0].shape
    is_all_same_size = all([np.all(image.shape==reference_image_size) for image in images])
    if not is_all_same_size:
        show_message_box(viewer.window,
                         message="Stack cannot be compiled. All images need to be of the same size.",
                         title='Load Images as Stack')
        return

    # Stack images
    data = [image.dask_data for image in images]
    image_stack = da.concatenate(data, axis=2)
    image_layer = viewer.add_image(image_stack, name=filenames[0].stem)
    image_layer.metadata['aicsimage'] = images
    image_layer.metadata['filename'] = filenames
    viewer.reset_view()

Alternatives

1. Load images seperatly.
2. Combine them to stack