Modify torch.movedim to handle scalar as no-op (#69537)
Summary:
`torch.movedim` directly handle the case of a scalar tensor (0-dim) in input as a no-op by returning a view of the input tensor (after all the usual checks for the other parameters)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69537
Test Plan:
This code now works fine and res1 is a view of tensor
```
import torch
tensor = torch.rand(torch.Size([]))
res1 = torch.movedim(tensor, 0, 0)
```
Fixes https://github.com/pytorch/pytorch/issues/69432
Reviewed By: jbschlosser
Differential Revision: D33020014
Pulled By: albanD
fbshipit-source-id: b3b2d380d70158bd3b3d6b40c073377104e09007
