Add support for embedded images

[kaoDev]

We are using a lottie animation with embedded images in our onboarding flow, the images are part of the JSON lottie file as base64 strings.

Currently it looks like those base64 elements are ignored, the animation is still playing, but only the vector based parts are visible.

Is support for rasterized elements is planned?

[zaferatli]

any updates?

[DanC5]

@hannojg are you guys planning to support embedded images soon? It sounds like this feature was recently added. I'd love to rip out Lottie, but this lack of support is preventing us from adopting at the moment, thanks

mono/SkiaSharp.Extended#277