Adds arccos, arcsin, arctan aliases (#43319)
Summary:
These aliases are consistent with NumPy (see, for example, https://numpy.org/doc/stable/reference/generated/numpy.arccos.html?highlight=acos).
Note that PyTorch's existing names are consistent with Python (see https://docs.python.org/3.10/library/math.html?highlight=acos#math.acos) and C++ (see, for example, https://en.cppreference.com/w/cpp/numeric/math/acos).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43319
Reviewed By: pbelevich
Differential Revision: D23260426
Pulled By: mruberry
fbshipit-source-id: 98a6c97f69d1f718a396c2182e938a7a260c0889
