[c10d] Add xpu to the default device supported by user specified backend #103410
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/103410
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Motivation:
For collective dispatching, we want to provide a more user friendly usage for xpu device and CCL backend (user specified backend) mapping.
Solution:
We add xpu to the default device list, and it can construct the mapping between xpu and the user specified backend directly.
Usage:
When using xpu device, user can specify backend name only:
dist.init_process_group(backend='ccl')