* feat(mobile): avif decoder
* decode avif in the core first on android, tone-map hdr like jxl and support premultiplied alpha
* decode avif with rav1d's safe api
* use rav1d's assembly
* thread avif decodes by their tile count
* convert colour-managed avif in bands
* use the codec dependencies' simd kernels
* free avif pictures before resizing
* map avif alpha through a table
* premultiply avif while writing alpha
* drop the avif container after decoding
* use core avif decoder on ios
* fall back to imageio on ios when the core can't decode an avif
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Co-authored-by: mertalev <101130780+mertalev@users.noreply.github.com>
