Just pass SupportedTensorDtypes for each tensor to apply_ternary_elementwise_fn (#5834)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/5834

No more function pointers! Also, we check that each Tensor's type is in the allowed set.
ghstack-source-id: 246132261
exported-using-ghexport

Reviewed By: manuelcandales

Differential Revision: D63794199

fbshipit-source-id: c811b0359f0465ad6fa0a7e742ecb932433a4122