[ONNX] Add src/index dynamic axes support for aten::scatter_add (#90090)
Extend from #89787 , and answer from https://github.com/onnx/onnx/issues/4672, dynamically catching shape of index can let converter further support on this op.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90090
Approved by: https://github.com/BowenBao
