[PoC] replace serializable with pipeline test for prototype datasets

[pmeier]

Proof of concept for pytorch/pytorch#74958 (comment).

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit c5ace3e (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages

unittest_prototype (1/1)

Step: "Run tests" (full log | diagnosis details | 🔁 rerun)

/home/circleci/project/torchvision/__init__.py:...oject source and relaunch your python interpreter.

  File "/home/circleci/.local/lib/python3.7/site-packages/torch/utils/data/datapipes/_typing.py", line 365, in wrap_generator
    response = gen.send(None)
  File "/home/circleci/.local/lib/python3.7/site-packages/torchdata/datapipes/iter/util/plain_text_reader.py", line 152, in __iter__
    yield from self._helper.return_path(stream, path=path)  # type: ignore[misc]
  File "/home/circleci/.local/lib/python3.7/site-packages/torchdata/datapipes/iter/util/plain_text_reader.py", line 61, in return_path
    yield from stream
_csv.Error: line contains NUL

�[33m=============================== warnings summary ===============================�[0m
torchvision/__init__.py:28
  /home/circleci/project/torchvision/__init__.py:28: UserWarning: You are importing torchvision within its own root folder (/home/circleci/project). This is not expected to work and may give errors. Please exit the torchvision project source and relaunch your python interpreter.
    warnings.warn(message.format(os.getcwd()))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
------ generated xml file: /home/circleci/project/test-results/junit.xml -------
============================= slowest 20 durations =============================
186.44s call     test/test_prototype_builtin_datasets.py::TestCommon::test_pipeline[imagenet-train-thread]
128.83s call     test/test_prototype_builtin_datasets.py::TestCommon::test_pipeline[imagenet-val-thread]
19.63s call     test/test_prototype_builtin_datasets.py::TestCommon::test_pipeline[caltech256-thread]
12.67s call     test/test_prototype_builtin_datasets.py::TestCommon::test_pipeline[caltech101-thread]
6.48s call     test/test_prototype_builtin_datasets.py::TestCommon::test_num_samples[qmnist-test]

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[pmeier]

Superseded by #5711.