Port `addcmul` kernels to structured kernels. (#62318)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62318
Tracking issue: #55070
This PR introduces the method `TensorIteratorBase::build_ternary_op` for building a
`TensorIteratorBase` for 3-input 1-output kernel.
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D29961997
Pulled By: bdhirsh
fbshipit-source-id: 2208d24823bad6e74c8d508f363716d8125b8619
