Add AVIF plugin (decoder + encoder using libavif) #537

Job	Run time
macOS 10.10 x86_64	42m 41s
sdist	23s
macOS 10.13 x86_64	44m 59s
macOS 10.15 x86_64	38m 33s
macOS arm64	28m 59s
Windows x86	21m 14s
manylinux2014 and musllinux x86_64	1h 26m 24s
Windows AMD64	47m 6s
manylinux_2_28 x86_64	37m 51s
Windows ARM64	10m 42s
manylinux2014 and musllinux aarch64	1h 3m 42s
manylinux_2_28 aarch64	32m 22s
Upload wheels to scientific-python-nightly-wheels	0s
Upload release to PyPI	0s
	7h 34m 56s

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