Adding SDK Example runner python script that runs through e2e test with output verification

[tarun292]

Command to run this:

python3 sdk_example_runner.py --executorch_root_dir /Users/tkaruturi/Documents/Projects/executorch 

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/1383

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 31196dd with merge base adae047 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Lint / lintrunner / linux-job (gh)

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