Replace SpatialImage and MultiscaleSpatialImage with DataArray and DataTree

[LucaMarconato]

The new releases of spatial_image and multiscale_spatial_image use these the base classes DataArray and DataTree. We need to:

• [ ] add support for these classes
• [ ] remove the version pin from the dependencies in pyproject.toml

Note. This modification will introduce a breaking change. I propose to develop this feature in a parallel branch that we release together with the rest of IO refactoring. CC @giovp @melonora @kevinyamauchi