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Description
What should we add?
Add a convenience method to compute the outer product of two bindings arrays. Eg
class BindingsArray:
def outer(self, other: BindingsArray) -> BindingsArray:
# validate self and other have distinct parameters
# reshape arrays to append 1 dims to self and prepend 1 dims to ther
# construct the data dict combining the two bas
... where ba_outer = ba1.outer(ba2) has ba_outer.shape = (*b1.shape, *ba2.shape).