Pass coords to UxDataArray (#818)

in core/dataarray.py

Otherwise, _slice_from_grid loses coordinate labels (the index values).

Co-authored-by: Philip Chmielowiec <67855069+philipc2@users.noreply.github.com>

uxarray/core/dataarray.py

@@ -1093,6 +1093,7 @@ def _slice_from_grid(self, sliced_grid):
             uxgrid=sliced_grid,
             data=d_var,
             name=self.name,
+            coords=self.coords,
             dims=self.dims,
             attrs=self.attrs,
         )