Qualcomm AI Engine Direct - File Structure Refactoring

[winskuo-quic]

Summary:

• Refactor the structure of example scripts based on different categories for models coming from AIHub, open source, or ExecuTorch itself.
• Updated README to help user better understanding the file structure and difference among different model categories.
• Added a new filed in CI for models coming from AIHub.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4626

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit 9f74eaa with merge base 99e1ae1 ():

NEW FAILURES - The following jobs have failed:

• Android / test-llama-app (bpe) / mobile-job (android) (gh)
  Could not assume role with user credentials: User: arn:aws:sts::308535385114:assumed-role/gh-ci-github-action-runners-runner-role/i-0ad10fff845922e01 is not authorized to perform: sts:TagSession on resource: arn:aws:iam::308535385114:role/gha_workflow_mobile_job
• Apple / upload-frameworks-ios (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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[winskuo-quic]

Hi @cccclai,
This PR is used to update the current file structure and README.
Please have a look on this PR.
Just a friendly reminder, there is currently another PR by @chiwwang updating the documentation(#4590)
Either of us will rebase and resolve any conflict after one of them got merged.
Thanks

[winskuo-quic]

Hi @cccclai,
I have rebased to the mainline, with conflicts resolved.
Please have a look.
Thanks

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