coordinateTransformations generated for 0.4 are scale-only

[d-v-b]

The most common methods of image downsampling result in a translation of the downsampled image, but this code for generating coordinateTransformations metadata only returns scale transformations, which will be incorrect for almost all multiscale pyramids.

ome-zarr-py/ome_zarr/format.py

Lines 260 to 271 in 56f72b0

	def generate_coordinate_transformations(
	self, shapes: List[tuple]
	) -> Optional[List[List[Dict[str, Any]]]]:
	data_shape = shapes[0]
	coordinate_transformations: List[List[Dict[str, Any]]] = []
	# calculate minimal 'scale' transform based on pyramid dims
	for shape in shapes:
	assert len(shape) == len(data_shape)
	scale = [full / level for full, level in zip(data_shape, shape)]
	coordinate_transformations.append([{"type": "scale", "scale": scale}])
	return coordinate_transformations

Suggested fix: generate translation transforms