Use llm_config instead of args in export_llama functions

[jackzhxng]

Stack from ghstack (oldest at bottom):

• -> Use llm_config instead of args in export_llama functions #11084
• Convert args to LlmConfig #11081
• Introduce hydra framework with backwards compatibility #11029
• Add new export LLM config #11028

Differential Revision: D75263988

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11084

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❌ 6 New Failures, 2 Unrelated Failures

As of commit a9ae56a with merge base f24094e ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  AttributeError: 'Namespace' object has no attribute 'quantization'. Did you mean: 'quantization_mode'?
• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  AttributeError: 'Namespace' object has no attribute 'quantization'. Did you mean: 'quantization_mode'?
• pull / test-llama_runner_eager-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 50c5b9c1b5fd6adb508ce22ef04ba20ccf131cbdae499e435f0fc9d57aa1d3c5 /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 08c50046b40431a0c71bdd017905fea12df39c44db9c2f674350daf521ba8ae9 /exec failed with exit code 1
• pull / test-llava-runner-linux / linux-job (gh)
  test_llava_export

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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[jackzhxng]

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