Remove private PIL kernels from __init__.py

[NicolasHug]

This removes all the private PIL kernels from torchvision.transforms.v2.functional.__init__.py.

This is mostly to avoid users to think that those are public just because they're exposed in __init__.py. That happens more often that we'd want, and it's best to prevent that confusion.

cc @vfdev-5

[pytorch-bot]

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❌ 6 New Failures, 1 Unrelated Failure

As of commit 7785b4d with merge base 924b162 ():

NEW FAILURES - The following jobs have failed:

• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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

• Tests / unittests-macos (3.10, macos-12) / macos-job (gh)

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