call tensor-only kernels from prototype kernels if possible

[pmeier]

Addresses the first part of #5421 (comment). The idea behind this change is to make it more clear that our low-level kernels are tensor only and thus cannot use the same route as PIL images in the dispatch. There are two caveats:

1. Some old kernels are only implemented for tensors and thus the kernel is implemented in torchvision.transforms.functional directly:
   • erase
   • normalize
2. Some kernels are composite and thus don't have a PIL or tensor implementation and thus are also only implemented in torchvision.transforms.functional
   • center_crop
   • resized_crop
   • ten_crop
   • five_crop

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 47ed932 (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:

lint_python_and_config (1/1)

Step: "Install pre-commit hooks" (full log | diagnosis details | 🔁 rerun)

ERROR: Command errored out with exit status 1: ...mpjx2nnnxd Check the logs for full command output.

          docstring, version = get_docstring_and_version_via_import(target)
        File "/tmp/pip-build-env-qewtmp8m/overlay/lib/python3.7/site-packages/flit_core/common.py", line 171, in get_docstring_and_version_via_import
          spec.loader.exec_module(m)
        File "<frozen importlib._bootstrap_external>", line 728, in exec_module
        File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
        File "/home/circleci/.cache/pre-commit/repos5s0yky8/ufmt/__init__.py", line 6, in <module>
          from .__version__ import __version__
      ModuleNotFoundError: No module named 'flit_core.dummy'
      ----------------------------------------
    WARNING: Discarding file:///home/circleci/.cache/pre-commit/repos5s0yky8. Command errored out with exit status 1: /home/circleci/.cache/pre-commit/repos5s0yky8/py_env-python3.7/bin/python /home/circleci/.cache/pre-commit/repos5s0yky8/py_env-python3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpjx2nnnxd Check the logs for full command output.
    ERROR: Command errored out with exit status 1: /home/circleci/.cache/pre-commit/repos5s0yky8/py_env-python3.7/bin/python /home/circleci/.cache/pre-commit/repos5s0yky8/py_env-python3.7/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpjx2nnnxd Check the logs for full command output.
    
Check the log at /home/circleci/.cache/pre-commit/pre-commit.log


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[datumbox]

As discussed offline with @pmeier we will close this PR and move it to the changes directly to #5421 so that everything is in one place.