[Cherry-pick for 0.21] Migrate avif and heic decoders to torchvision-extra-decoders repo #8800
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CP of #8671
I created the
release/0.21a few minutes before I landed #8671 on main, so this needs to be cherry-picked. This is by design: I need to closely monitor any potential issue with that specific PR, that's why I didn't land it on main before the branch cut. So, this is definitely not a "last minute rushed cherry-pick", it's 100% supposed to be part of this release, and having it as a CP helps debugging any potential problem.