Add transparency and >8bits images support to AVIF decoder

[NicolasHug]

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[pytorch-bot]

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✅ You can merge normally! (7 Unrelated Failures)

As of commit 404645a with merge base 4d6f0c0 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• CMake / macos (macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / windows (windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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