[et device 1/n] introduce cuda device type

[Gasoonjia]

Stack from ghstack (oldest at bottom):

• -> [et device 1/n] introduce cuda device type #17400

This diff introduces new device type, cuda, which will be used for further device type support use.

Differential Revision: D92928772

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17400

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❌ 2 New Failures

As of commit bf47f62 with merge base c09db81 ():

NEW FAILURES - The following jobs have failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 8558a9037fd0d3534383543e8e1b0db92a681a9d18f35b6a697c36e8bb2fd72d /exec failed with exit code 139
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 3bb8182ebf9d05b2cb13c01676592a3fca54484b7acb44f0df1797bea5262e92 /exec failed with exit code 1

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[JacobSzwejbka]

Review automatically exported from Phabricator review in Meta.

[github-actions]

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