Adding in whisper tiny export script in examples

[BujSet]

Summary

Work in progress

Fixes #12352

Test plan

Tested by running python3 -m examples.portable.scripts.export --model_name="whisper_tiny"

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12680

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❗ 1 Active SEVs

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❌ 6 New Failures

As of commit 2df3bbd with merge base a624083 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for examples/models/whisper_tiny/model.py:
• pull / unittest / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t bee51b3b0720db84ae8d0de7f918ab5cfc28133b60aac4a386d55bf5294ed3aa /exec failed with exit code 128
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 92d0ad898f215858648c3d71b78feb87eccf6cbe531b77898b70d4b21f87a8aa /exec failed with exit code 128
• pull / unittest-buck / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1

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[BujSet]

@pytorchbot label "release notes: none"