update tensor impl support_as_strided for nested tensors (#79616)
This is needed for supporting nested tensors with autograd. See this discussion: https://github.com/pytorch/pytorch/pull/79446#discussion_r896334299
I was deciding between 3 options:
1. The proposed change- update impl base
2. Override function without making the base class method virtual
3. Make support_as_strided() virtual on base and override on nested
The comment above in impl made me think that option 1 is okay but feel free to correct me
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79616
Approved by: https://github.com/albanD, https://github.com/soulitzer
