allow stretched grid decomposition

[chrishavlin]

If yt-project/yt#4732 goes in to yt, we can allow the chunksizes argument with stretched grids. Should just be a matter of deleting:

yt_xarray/yt_xarray/accessor/accessor.py

Lines 117 to 120 in 740e086

	elif sel_info.grid_type == _xr_to_yt._GridType.STRETCHED:
	raise NotImplementedError(
	"Stretched grids cannot set the chunksizes argument."
	)

[chrishavlin]

4732 merged upstream

[chrishavlin]

yt 4.4 is out! should be able to get this working now.

[chrishavlin]

oops... might have to wait til yt 4.4.1... yt-project/yt#5052

[chrishavlin]

4.4.1 is out! this should be do-able now.