Respect xarray coordinates for ImageContainers

[conradfoo]

Is your feature request related to a problem? Please describe.
Currently, if I parse an xarray DataArray into an image container, the coordinates are overwritten with pixel coordinates even if I do not specify a transformation.

Describe the solution you'd like
Transfer over the xarray coordinates from the initial xarray into the spatialdata object

Describe alternatives you've considered
It is possible (but annoying) to construct a transformation object from my coordinate list and feed that into the constructor.

Additional context
I'm using spatialdata-0.2.3
Thanks!

[LucaMarconato]

Hi @conradfoo, thanks for reporting.

We actually want to implement this feature. Tracked here #308 (in "there will be a helper function to convert back and forth between BaseTransformation (and so also NGFFBaseTransformation) and xarray coordinates."). I will increase the priority of this feature request.