Reference implementations for rot90, roll, atleast_1d,2d,3d (#78080)
This PR adds the following references:
- `rot90`
- `roll`
- `atleast_1d`
- `atleast_2d`
- `atleast_3d`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78080
Approved by: https://github.com/mruberry
