Improve autograd integration with ufuncs and array-like containers #717
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Avoid creating two different wrappers for the same object in wrap_namespace. Generally cleaner, but more importantly towards better ufuncs support, which will require mapping from ufuncs to their wrapped version. Another minor pro is that this theoretically avoids needing to define grads for two names of the same object, e.g., we could define the VJP for anp.conj but not for anp.conjugate since they are actually the same wrapped object. However, it's minor and theoretical because whether or not two "equivalent" numpy functions/ufuncs are the same object is apparently an implementation detail, e.g., np.amax is documented as an alias of np.max, but they actually aren't the same object, and the equivalent ufuncs np.degrees and np.rad2deg are two different ones (tested on numpy 2.3.1). Because this might change between different numpy version, it's more robust to keep the grad definitions for both names.
Makes xarray.DataArray recognize a contained ArrayBox wrapping a single float as a duck array and forward ufuncs to it (see is_duck_array() called in __array_ufunc__() in xarray/computation/arithmetic.py)
Specifically, allows doing real work with xarray.DataArrays containing ArrayBoxes.
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Specifically, allows doing real work with
xarray.DataArrays containingArrayBoxesBased over #716