Add initializer with file and data file paths

[shoumikhin]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13830

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❌ 3 New Failures, 96 Pending

As of commit 25769de with merge base 1f18326 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d9e13aedbbf824ee2b3c29a5cf7650772d1d8eb81b27a0f4d1649ce79e5f1557 /exec failed with exit code 139
• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 139

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