Support NestedTensor for XPU device

[min-jean-cho]

🚀 The feature, motivation and pitch

Support NestedTensor for xpu device

• [Intel GPU] Add NestedTensorXPU to parseDispatchKey and codegen pytorch/pytorch#140461
• Add RegisterNestedTensorXPU codegen #1140
• Add NestedTensorXPU dispatch for device-agnostic NestedTensor Ops #1142
• Add NestedTensor XPU ops
  • Add aten::_nested_from_padded #1045
• Add NestedTensor XPU Uts

Example

>>> nt = torch.nested.nested_tensor([]).to("xpu")
>>> nt
nested_tensor([

], device='xpu:0')
>>> nt.is_xpu
True

Alternatives

No response

Additional context

No response