Add function to check resolution levels and their shapes

[vianamp]

See conversation here. Add a function like this

    def list_zarr_levels_and_dims(file_path:str):
        reader = BioImage(file_path, reader=bioio_ome_zarr.Reader)
        levels = reader.resolution_levels
        print(f"Found ZAR file with {len(levels)} resolution levels.")
        for lvl in levels:
            reader.set_resolution_level(lvl)
            print(f"\tLevel {lvl} shape: {reader.shape}")
        return