Support animated image on iOS

[master-lzh]

Is your feature request related to a problem? Please describe.
Any plans to support animated images such as gif/animated webp on multiplatform?

Describe the solution you'd like
Right now only Android platforms can play animated images, on iOS it will only show the first frame of the image

Additional context

[colinrtwhite]

I think this is something we could support (no timeline) as I believe Skiko/Skia already support decoding GIF frames. We'd just need someone to write a custom Decoder that uses Skiko to implement support. Open to a PR if someone wants to contribute this!

[LaatonWalaBhoot]

@colinrtwhite Perhaps this could help?
https://github.com/panpf/sketch/blob/main/docs/wiki/animated_image.md
I am quite a noob so just suggesting if this could be used as a reference?

[valeriyo]

Upvoting 👍