Copy NamedTensorMeta in TensorImpl::copy_tensor_data()

[zou3519]

Stack from ghstack:

• Implement tensor.select(Dimname,int) #21795 Implement tensor.select(Dimname,int)
• Add at::dimname_to_position helper. #21789 Add at::dimname_to_position helper.
• named inference rule for tensor.select #21752 named inference rule for tensor.select
• Disallow creation of tensors with duplicate names #21781 Disallow creation of tensors with duplicate names
• Rename Dimname::name to Dimname::full_name #21803 Rename Dimname::name to Dimname::full_name
• Copy NamedTensorMeta in TensorImpl::copy_tensor_data() #21735 Copy NamedTensorMeta in TensorImpl::copy_tensor_data()
• Expose torch.empty(sizes, *, names, ...) to Python #21648 Expose torch.empty(sizes, *, names, ...) to Python

Test Plan:

• I'm not sure how to test this other than making sure it compiles.
• [namedtensor ci]

gh-metadata: pytorch pytorch 21735 gh/zou3519/49/head

Differential Revision: D15833456

[facebook-github-bot]

@zou3519 merged this pull request in 7c1528b.