[Request] Support APNG Image Compression

[wuyax]

Is your feature request related to a problem? Please describe.
APNG images are treated as regular PNG images, which does not preserve the animation effect of APNG.

Describe the solution you'd like
Properly compress APNG images while preserving the animation.

Describe alternatives you've considered
One possible solution I have considered is using other tools to split the APNG into multiple static PNG images, then compressing these images individually, and finally reassembling them into an APNG animation.

Additional context
No additional context.