Refactor `LayerCreator.profile`

[ppinchuk]

LayerCreator.profile is kind of a mess, and throughout the code we have a lot of places where we do:

with xr.open_dataset(self.fp, consolidated=False, engine="zarr") as ds:
            attrs = ds.attrs
            crs = ds.rio.crs
            transform = ds.rio.transform()
            coords = ds.coords

We should refactor away the .profile method in favor of the full dataset .attrs, and make it cached. Then users can get access to both geospatial info as well as chunk size