remove rioxarray dependency by detecting affine parameters

[dcherian]

Currently we depend on rio.transform:

https://github.com/dcherian/rasterix/blob/d6242e173e691fb3a017c42dbeca1a77c72184fb/src/rasterix/raster_index.py#L31

We don't need to do so.

When completed, we can remove rioxarray from the docs dependency group