Create Datatree Quadtree

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For downsampled Sv data create a prototype of Sv data regridded to fit within the x array datatree prototype.

E.g.
from datatree import DataTree

ds1 = xr.Dataset({"foo": "orange"})

dt = DataTree(name="root", data=ds1) # create root node

dt
Out[4]:
DataTree('root', parent=None)
Dimensions: ()
Data variables:
foo <U6 24B 'orange'