Reverse spatial ome metadata when parsing it to avoid reversing the axis order later

[constantinpape]

n5-java reverses the known spatial metadata that is stored by zarr (the dimensions and the chunks). ome.zarr contains other spatial metadata, e.g. scale and translation. These are read in the native zarr axis order (i.e. reversed compared to dimensions and chunks). As a consequence we need to reverse the indices when reading from e.g. scale.
This can be quite confusing. Instead, we could reverse the ome.zarr spatial metadata when initially parsing it, and then could use the same axis order for everything.