feat: add JXL thumbnail and animated APNG + WEBP support (port #344 and partially port #357) #549
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This PR is a port of both #344 and #357 which previously targeted thumbnails/Alpha-v9.4 to main (aka v9.5x).
This adds thumbnail/preview support for JXL images (based on #344) and adds animated playback of APNG and WEBP images (based on #357)
Closes #333.