Add AVIF plugin (decoder + encoder using libavif) #455

Job	Run time
aarch64 pp310 manylinux2014	1h 9m 6s
macOS 10.10 x86_64	50m 34s
aarch64 pp310 manylinux_2_28	1h 15m 17s
macOS 10.13 x86_64	57m 28s
Windows x86	20m 45s
aarch64 cp3{9,10,11} manylinux2014	1h 9m 11s
macOS 10.15 x86_64	42m 48s
Windows AMD64	47m 35s
aarch64 cp3{9,10,11} manylinux_2_28	1h 16m 31s
macOS arm64	29m 27s
sdist	35s
Windows ARM64	12m 47s
aarch64 cp3{9,10,11} musllinux	1h 9m 21s
aarch64 cp3{12,13} manylinux2014	1h 22m 29s
manylinux2014 and musllinux x86_64	52m 53s
aarch64 cp3{12,13} manylinux_2_28	1h 27m 35s
manylinux_2_28 x86_64	38m 56s
aarch64 cp3{12,13} musllinux	1h 16m 32s
Upload wheels to scientific-python-nightly-wheels	1s
Upload release to PyPI	1s
	15h 59m 52s

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