support preconditioner for `conjugated_gradient()` in `linear_equations.py` (#16237)
* support preconditioner for conjugated_gradient() in linear_equations.py * support preconditioner for conjugated_gradient() in linear_equations.py amend email to pass CLA check * add jacobi, None test, insert np extra op when preconditioner=None * using linalg_ops.norm() instead of util.l2norm_squared()
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