Implemement smoke_test.py for pip wheel jobs

[dbort]

Stack from ghstack (oldest at bottom):

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• -> #3474

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This script is run by CI after building the executorch wheel. Before running this, the job will install the matching torch package as well as the newly-built executorch package and its dependencies.

For now we test the export of a simple model, and try executing it using the runtime pybindings.

Test Plan:

./install_requirements.sh
python build/packaging/smoke_test.py

Differential Revision: D56857490

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3474

• :page_facing_up: Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

:x: 2 New Failures

As of commit afb0a3ce7814d898dc49a765607088b4b2b14d50 with merge base 5d2a17b29f57ab77f0481ca1d96d827e610dc4bf ():

NEW FAILURES - The following jobs have failed:

* [Build Linux Wheels / pytorch/executorch / upload / manywheel-py3_8-cpu](https://hud.pytorch.org/pr/pytorch/executorch/3474#24487122803) ([gh](https://github.com/pytorch/executorch/actions/runs/8916101561/job/24487122803)) `Unable to find any artifacts for the associated workflow` * [Build M1 Wheels / pytorch/executorch / upload / wheel-py3_8-cpu](https://hud.pytorch.org/pr/pytorch/executorch/3474#24487091804) ([gh](https://github.com/pytorch/executorch/actions/runs/8916101540/job/24487091804)) `Unable to find any artifacts for the associated workflow`

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[dbort]

@dbort has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@dbort merged this pull request in pytorch/executorch@f8a4d8cd912e993be3424c5f599b3b61a4b69f3f.