[ONNX] Enable aten:normal op and add tests for aten:uniform op. (#60441) (#61560)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61560
1. Add a new symbolic function broadcast_tensors() to support exporting torch.broadcast_tensors() function. This is required by exporting torch.distribution.normal() function.
2. Add a new symbolic function normal() to support exporting torch.distribution.normal() function.
3. Add relative tests for normal and uniform ops as well.
Test Plan: Imported from OSS
Reviewed By: nikithamalgifb
Differential Revision: D29767995
Pulled By: SplitInfinity
fbshipit-source-id: acfe5e7801d00c0df8ca46966bbd6015fed0045e
Co-authored-by: Jay Zhang <jiz@microsoft.com>
