Add tests for CUDA GDR XDTT channel.

[beauby]

Stack from ghstack:

• 428 Fix test for interleaved zero-length tensors.

• 427 Enable CPU buffers in CUDA GDR XDTT channel.

• 426 Handle CPU buffers in CUDA GDR XDTT.

• #425 Add tests for CUDA GDR XDTT channel.

• 424 Add IbvNic::registerMemory overload for CPU buffers.

• 423 Add CMake declaration for cuda_gdr_xdtt.

• 422 Rename new channel to Cuda Xdtt.

• 421 Duplicate CUDA GDR channel for XDTT.

Differential Revision: D33399438

[beauby]

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