Eager mode: binary ops more complete behavior and testing. (#12293)
* Remove hand written add_.Tensor as it can now be generated.
* Generate .out for tensor version of basic math ops. Add.out testing added too.
* Remove sin tests as they are covered by parameterized tests. Also, moved all parameterized tests to the end in their own section.
* Add binary ops tests for tensors. Scalar tests are calling the aten .out which is for tensor.
* Add support for scalar input to add, div, mul, and sub.