Add AVIF plugin (decoder + encoder using libavif) #337

Job	Run time
aarch64 pp310 manylinux2014	3h 22m 35s
macOS 10.10 x86_64	37m 29s
aarch64 pp310 manylinux_2_28	3h 35m 38s
macOS 10.13 x86_64	32m 56s
aarch64 cp3{9,10,11} manylinux2014	3h 19m 4s
macOS 10.15 x86_64	24m 12s
aarch64 cp3{9,10,11} manylinux_2_28	3h 31m 1s
aarch64 cp3{9,10,11} musllinux	3h 40m 6s
macOS arm64	20m 1s
aarch64 cp3{12,13} manylinux2014	3h 0m 8s
manylinux2014 and musllinux x86_64	1h 4m 27s
aarch64 cp3{12,13} manylinux_2_28	3h 16m 20s
manylinux_2_28 x86_64	31m 22s
aarch64 cp3{12,13} musllinux	3h 22m 18s
sdist	23s
Windows x86	21m 28s
Windows AMD64	37m 12s
Windows ARM64	11m 41s
Upload wheels to scientific-python-nightly-wheels	0s
Upload release to PyPI	0s
	1d 7h 48m 21s

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